Unlockables

Armor Permutations Unlockables

Body Pieces: Spartan marked with (S) and Elite marked with (E).

Unlockable	How to Unlock
(E) Ascetic Body	Unlock "Up Close and Personal" Achievement
(E) Ascetic Head	Unlock "Steppin' Razor" Achievement
(E) Ascetic Shoulders	Unlock "Overkill" Achievement
(E) Commando Body	Unlock "Triple Kill" Achievement
(E) Commando Head	Unlock "Overkill" Achievement
(E) Commando Shoulders	Unlock "Killing Frenzy" Achievement
(E) Flight Body	Complete Tsavo Highway On Herioic or Legendary
(E) Flight Head	Complete Campaign mode on Heroic difficulty.
(E) Flight Shoulders	Complete The Ark on Heroic difficulty or higher.
(S) EOD Body	Complete Tsavo Highway on Legendary
(S) EOD Head	Complete Campaign mode on Legendary Difficulty
(S) EOD Shoulders	Complete The Ark on Legendary difficulty
(S) EVA Body	Complete Tsavo Highway on Normal or higher
(S) EVA Head	Complete Campaign mode on Normal
(S) EVA Shoulders	Complete The Ark on Normal difficulty or higher.
(S) Hayabusa Chest	Collect 5 hidden skulls
(S) Hayabusa Helmet	Collect 13 hidden skulls
(S) Hayabusa Shoulders	Collect 9 hidden skulls
(S) Katana	Complete all Achievements (1000/1000)
(S) Mark V Head	Unlock "UNSC Spartan" Achievement
(S) ODST Head	Unlock "Spartan Graduate" Achievement
(S) Rogue Head	Unlock "Spartan Officer" Achievement
(S) Scout Body	Unlock "Too Close to the Sun" Achievement
(S) Scout Head	Unlock "Used Car Salesman" Achievement
(S) Scout Shoulders	Unlock "Mongoose Mowdown" Achievement
(S) Security Head	Earn 1000 Gamerscore points.
(S) Security Shoulders	Currently glitched, no 100% working method to obtain or keep

Multiplayer Medals

If you do the following things you will get the medal while playing multiplayer. When you do the task usually it will show you by a little icon of the said medal appearing in the corner of the screen. Also at the end of each match you can check what medals you got. You can also check your overall medal count on bungie's official website. A very small amount of these are secret medals in that they don't tell you right when you get them but they will appear in your medal history. (One example of such a medal is the Steaktacular! Medal)

Unlockable	How to Unlock
Assassin!	Hit and kill an opponent with a melee attack from behind.
Beat Down!	Hit and kill an opponent with a melee attack.
Bomb Planted!	Plant the bomb in a Assault Gametype.
Bulltrue!	Kill an opponent who is in the act of a sword lunge.
Death from the Grave!	Kill an opponent after you have died.
Double Kill!	Kill 2 opponents within 4 seconds of each other.
Extermination!	Get an overkill on the opposing team, wiping out all of the members.
Flag Kill!	Get a melee kill with the flag in a CTF gametype.
Flag Score!	Capture the opposing team's flag in a CTF gametype.
Grenade Stick!	Kill an opponent by sticking him/her with a Plasma Grenade or a Spike Grenade.
Hail to the King!	Kill 5 consecutive opponents in a single life from inside the hill before it moves in a King of the Hill gametype.
Hell's Janitor!	Kill 10 zombies in a row as a human without dying in an Infection gametype.
Highjacker!	Board an enemy ground vehicle.
Incineration!	Kill an opponent by using the Flamethrower.
Infection Spree!	Kill 5 humans in a row as a zombie without dying in an Infection gametype.
Invincible!	Kill 30 opponents in a row without dying.
Juggernaut Spree!	Kill 5 consecutive opponents in a single run as the Juggernaut in a Juggernaut gametype.
Killapocalypse!	Kill 9 opponents within 4 seconds of each other.
Killed Bomb Carrier!	Kill the opposing bomb carrier in a Assault Gamtype.
Killed Flag Carrier!	Kill the opposing flag carrier in a CTF gametype.
Killed Juggernaut!	Kill the Juggernaut in a Juggernaut gametype.
Killed VIP!	Kill the opposing VIP in a VIP Gametype.
Killimanjaro!	Kill 7 opponents within 4 seconds of each other.
Killing Frenzy!	Kill 10 opponents in a row without dying.
Killing Spree!	Kill 5 opponents in a row without dying.
Killionaire!	Kill 10 opponents within 4 seconds of each other.
Killjoy!	End an opponent's killing spree—any spree.
Killtacular!	Kill 5 opponents within 4 seconds of each other.
Killtastrophe!	Kill 8 opponents within 4 seconds of each other.
Killtrocity!	Kill 6 opponents within 4 seconds of each other.
Laser Kill!	Kill an opponent by using the Spartan Laser.
Last Man Standing!	Be the last human of the game in an Infection gametype.
Linktacular!	Play in a matchmade game comprised of all Bungie.net users. (Secret Medal)
Mmmm Brains!	Kill 10 humans in a row as a zombie without dying in an Infection gametype.
Oddball Kill!	Get a melee kill when holding the ball in a Oddball gametype.
Open Season!	Gun down 10 opponents with a Shotgun in a row without dying.
Overkill!	Kill 4 opponents within 4 seconds of each other.
Perfection!	Win a slayer game with 15+ kills without dying.
Rampage!	Kill 20 opponents in a row without dying.
Running Riot	Kill 15 opponents in a row without dying.
Sharpshooter!	Snipe 10 opponents in a row without dying.
Shotgun Spree!	Gun down 5 opponents with a Shotgun in a row without dying.
Skyjacker!	Board an enemy aircraft.
Slice 'N Dice!	Cut down 10 opponents with the Plasma Sword in a row without dying.
Sniper Kill!	Kill an opponent by using a sniping weapon.
Sniper Spree!	Snipe 5 opponents in a row without dying.
Splatter Spree!	Splatter 5 opponents in a row without dying.
Splatter!	Hit and kill an opponent with a vehicle.
Steaktacular!	Beat the opposing team by over 20 kills; (Luke owes you a steak dinner) (Secret Medal)
Sword Spree!	Cut down 5 opponents with the Plasma Sword in a row without dying.
Triple Kill!	Kill 3 opponents within 4 seconds of each other.
Unstoppable!	Kill 10 consecutive opponents in a single run as the Juggernaut in a Juggernaut gametype.
Untouchable!	Kill 25 opponents in a row without dying.
Vehicular Manslaughter!	Splatter 10 opponents in a row without dying.
Wheelman!	Be the driver of a vehicle when a passenger kills an opponent.
Zombie Killing Spree!	Kill 5 zombies in a row as a human without dying in an Infection gametype.

Multiplayer Ranks

A list of the Skill and Experience needed to advance in rank. Note: you can skip ranks once there is a set skill requirement. For example, many people go from Lieutenant Grade 2 (Skill:10 EXP:85) straight to Captain (Skill:20 EXP:100)

Unlockable	How to Unlock
01 Recruit	Skill Needed: 0 EXP:1
02 Apprentice	Skill Needed: 0 EXP:2
03 Apprentice Grade 2	Skill Needed: 0 EXP:3
04 Private	Skill Needed: 0 EXP:5
05 Private Grade 2	Skill Needed: 0 EXP:7
06 Corporal	Skill Needed: 0 EXP:10
07 Corporal Grade 2	Skill Needed: 0 EXP:15
08 Sergeant	Skill Needed: 0 EXP:20
09 Sergeant Grade 2	Skill Needed: 0 EXP:30
10 Sergeant Grade 3	Skill Needed: 0 EXP:40
11 Gunnery Sergeant	Skill Needed: 0 EXP:50
12 Gunnery Sergeant Grade 2	Skill Needed: 0 EXP:60
13 Gunnery Sergeant Grade 3	Skill Needed: 0 EXP:150
14 Gunnery Sergeant Grade 4	Skill Needed: 0 EXP:300
15 Lieutenant	Skill Needed: 10 EXP:70
16 Lieutenant Grade 2	Skill Needed: 10 EXP:85
17 Lieutenant Grade 3	Skill Needed: 10 EXP:200
18 Lieutenant Grade 4	Skill Needed: 10 EXP:400
19 Captain	Skill Needed: 20 EXP:100
20 Captain Grade 2	Skill Needed: 20 EXP:150
21 Captain Grade 3	Skill Needed: 20 EXP:300
21 Captain Grade 4	Skill Needed: 20 EXP:600
22 Major	Skill Needed: 30 EXP:200
23 Major Grade 2	Skill Needed: 30 EXP:300
24 Major Grade 3	Skill Needed: 30 EXP:600
25 Major Grade 4	Skill Needed: 30 EXP:1,200
26 Commander	Skill Needed: 35 EXP:300
27 Commander Grade 2	Skill Needed: 35 EXP:450
28 Commander Grade 3	Skill Needed: 35 EXP:900
29 Commander Grade 4	Skill Needed: 35 EXP:1,800
30 Colonel	Skill Needed: 40 EXP:400
31 Colonel Grade 2	Skill Needed: 40 EXP:600
32 Colonel Grade 3	Skill Needed: 40 EXP:1,200
33 Colonel Grade 4	Skill Needed: 40 EXP:1,800
34 Brigadier	Skill Needed: 45 EXP:500
35 Brigadier Grade 2	Skill Needed: 45 EXP:1,000
36 Brigadier Grade 3	Skill Needed: 45 EXP:2,000
37 Brigadier Grade 4	Skill Needed: 45 EXP:4,000
38 General	Skill Needed: 50 EXP:600
39 General Grade 2	Skill Needed: 50 EXP:1,200
40 General Grade 3	Skill Needed: 50 EXP:2,500
41 General Grade 4	Skill Needed: 50 EXP:5,000

Cheat Codes

Hide Weapon, Show Coordinates & Camera Modes

The following cheats can be performed during a local match or replay only. You must simultaneously PRESS & HOLD the following buttons for 3 SECONDS to toggle the effect on / off.

KEYS:
LB = Left Bumper
RB = Right Bumper
LS = Click in on Left Analog Stick
RS = Click in on Right Alalog Stick

Code	Effect
LB + RB + LS + A + DOWN [D-PAD]	Toggle Hide Weapon
[HOLD LS + RS] Press Left on D-Pad	Toggle Pan-Cam / Normal while Show Corrdinates is enabled.
LB + RB + LS + A + UP [D-PAD]	Toggle Show Coordinates / Camera Mode

Halo 3 Secrets

Black-Eye Skull

Effect: Melee hits instantly recharges your shield.

Where to find: Crow's Nest

How to find: As soon as you start the level, head straight up to the higher level. Head toward the door with the red light, then turn around. Jump onto the racks, onto the red metal light holders, then onto the ventilation tube. The skull will spawn at the end.

Blind Skull

Description: "Shoot from the hip"

Stage: First Stage

How To Find: When you get to the area where you see the Phantom overhead (one of the marines will point it out) jump over the rocks and keep following the path on the right. When you get to the cliff there will be a rock over of the side. The skull is on the end of the rock.

Note: This skull has to be Activated before you start a Campaign map.

Catch Skull

Effect: all enemies have 2 grenades, throw more grenades

Level: The Storm

Location: From the start, go through until you go outside again. When you go outside look straight across there is a small round building straight out there, the skull is on top. In order to get up there you can either use a warthog as a platform or grenade-jump. DO NOT destroy the wraith near the door or the skull will disappear.

Cowbell Skull

Effect: Explosive force increased (sputnik from H2)

Level: The Ark

Location: First pick up a grav lift from the small building near where you fight the scarab. Now proceed through the level until you reach the second sloping hallway (stairway), you should see some partitioned risers (platforms) halfway down. The skull is on the top level. Toss the grav-lift on the right side of the hall so it lands on the fourth little green dot from the door. Then run, jump, and use the grav-lift to propel you to the top. You should reach a ckeckpoint just as you enter the room so it you miss just try again.

Famine Skull

Mission: The Ark

Effect: "Trust us. Bring a magazine." -- Dropped weapons will have very little ammo compared to normal.

When you first go into the valley to the right after the wrecked phantom, look to your left where you will see a huge boulder. Use a ghost and get to the side of the boulder that is closest to the bridge overhead. It is easy to pilot the ghost up the side of the wall using the thrust. To get the skull, pilot 2 ghosts up the wall to the top of the bridge and stack them one on top of another next to the beam where the skull is placed. Simply jump from the top of the ghosts towards the skull and land on the beam.

Fog Skull

Mission: Floodgate

Effect: "You’ll miss those eyes in the back of your head." -- Your motion sensor disappears.

As you are walking down from the anti-air gun you destroyed in the previous mission, you encounter a ramp (next to a missile launcher). Around this ramp, you hit a checkpoint. At this point, you should also hear a marine yelling, “There! Over There!”. Look up and to the right, directly at the roof of the building next to the missle launcher. There is a single flood form (not to be mistaken with the two other flood forms jumping in front of you) which is holding the skull. Kill him before he jumps, and he will drop the skull down to the ground where you can retrieve it. Too early, and the skull will get stuck on the roof though, so just time it carefully.

Grunt Birthday Party skull

Effect: Headshots on grunts cause heads to explode with confetti.

Where to find: Crow's Nest

How to find: Right after the first objective, while en route to the barracks, you will fall down onto a pipe. At the end of this pipe, look over the edge to see a small space a few feet below you. You must simply drop over and as quicly as you can, pull back to land under the floor you were just on. After that, the skull will be at the end.

Iron Skull

Effect: When either player dies in Co-Op on any difficulty both players will restart at last check point or in single player if you die you restart the level.

Where to Find: Sierra 117

How to find: In the area where you rescue Sarge, behind the prison cell is a large ledge. Got to the far right side and jump on the boxes, then onto the pipes to get up on the ledge, goto the far end of the ledge, turning two corners the skull is at the far end.

IWHBYD Skull

Mission: The Covenant

Effect: "But the dog beat me over the fence" - Unlocks bonus dialogue throughout the game. For most, this is the last skull, so this gives you the Hayabusa Helmet as well.

To get this, get to the room where you "fight" the Prophet of Truth. Let the Arbiter kill him, turn around, and kill all the Flood here as well; makes it a LOT easier. With all obstacles out of the way, you need to jump through the Halo holograms here in a specific order, listed below:

4 6 5 4 5 3 4

When you jump through the final hologram, they all light up in a sequential pattern. The Skull will be at the end waiting for you right before the energy bridge leading to Truth's corpse.

Mythic Skull

Effect: Every enemy on the field now has double their normal amount of health.

Where to find: Halo

How to find: As soon as the mission starts walk up the hill in front of you and into the cave. Hug the right side of the cave and after a large boulder you will see a path on your right, just take the short path and it will be at the end.

Tilt Skull

Mission: Cortana

Effect: "What was once resistant is now immunity" -- Enemies have different body parts that may be resistance to certain bullet types

When in the circular type room with all the flood look for a small structure piece next to two archways, jump on top if it and up on the rocks to the top left, turn left and jump up again, then do a 180 and jump to the rocks across from you. After that follow the the rock sticking out and leading up on top of of the original circular room, the skull will be in a pile of blood.

The 7 Terminals

The Ark:

1. Start the mission and once you enter the first building take a left into another door and now you should be in a curved corridor. On the inside is a Terminal.
2. After activating the bridge to let your comrades accross the gap, do a 180 and you should see it. (it does not open until you activate the bridge)
3. In the third building after defeating the scarab, kill the group of sleeping covenant, then follow the corridor downwards. Once you reach a door in front that is locked, immediately on the left there's an open door. Go through and walk straight off, then do a 180 to find a secret room. It is in there.

The Covenant:

1. When in the first tower standing on the lift, face the access panel and turn left. Jump over and it's right there.
2. Land your hornet on the second tower, walk towards the entrance but when you see the locked door, do a 180. Should be right in front of you.
3. When in the third tower standing on the lift, face the access panel and turn right. Jump over and it's right there.

Halo:

1. After reaching the end of the first cave, hug the right wall and you will see a building. Jump up onto the walkway and hang a left once inside. It's right there.

Thunderstorm Skull

Mission: The Covenant

Effect: "Field promotions for everyone!" -- Upgrades enemies to their stronger versions.

After you shut down tower 1 and get access to the hornet, fly to tower 2 (the one the arbiter shut down). While walking up the stairs, go to the middle part that connects both and there should be a stair leading up to a platform where the skull is.

Tough Luck Skull

Effect: Enemies do saving throws

Where to find: Tsavo Highway

On Tsavo Highway, about halfway through the mission (right after you are forced to walk through a large blue barrier), you will come out of a tunnel on the highway, and see a large pipeline on your left. Drop down in between the two, and run to the wall in front of you. Follow the wall all the way to where it connects with the cliff on your right, and turn to the left. There should be a few ledges--simply crouch jump from ledge to ledge, and the last one should have the "Tough Luck" skull on it.