HALO 3 CHEATS

Get Katana:
Unlock all achievements and collect all skulls.

Unlock Multiplayer Armor Parts:
Complete the indicated task in Campaign mode to unlock the corresponding armor part in Multi-player mode.

Spartan Security Shoulders: Earn 250 Gamerscore points.

Spartan Security Head: Earn 1,000 Gamerscore points.

Spartan Scout Shoulders: Earn the "We're in for Some Chop" achievement.

Spartan Scout Head: Earn the "Used Car Salesman" achievement.

Spartan Scout Body: Earn the "Too Close to the Sun" achievement.

Spartan Rogue Head: Earn the "Spartan Officer" achievement.

Spartan ODST Head: Earn the "Spartan Graduate" achievement.

Spartan Mark V Head: Earn the "UNSC Spartan" achievement.

Spartan EVA Shoulders: Complete "The Ark" under the Normal or higher difficulty.

Spartan EVA Head: Complete Campaign mode under the Normal or higher difficulty.

Spartan EVA Body: Complete "Tsavo Highway" under the Normal or higher difficulty.

Spartan EOD Shoulders: Complete "The Ark" under the Legendary difficulty.

Spartan EOD Head: Complete Campaign mode under the Legendary difficulty.

Spartan EOD Body: Complete "Tsavo Highway" under the Legendary difficulty.

Hayabusa Shoulders: Collect nine hidden skulls.

Hayabusa Helmet: Collect thirteen hidden skulls.

Hayabusa Chest: Collect six hidden skulls.

Elite Flight Shoulders: Complete "The Ark" under the Heroic or higher difficulty.

Elite Flight Head: Complete Campaign mode under the Heroic difficulty.

Elite Flight Body: Complete "Tsavo Highway" under the Heroic or Legendary difficulty.

Elite Commando Shoulders: Earn the "Killing Frenzy" achievement.

Elite Commando Head: Earn the "Overkill" achievement.

Elite Commando Body: Earn the "Triple Kill" achievement.

Elite Ascetic Shoulders: Earn the "Overkill" achievement.

Elite Ascetic Head: Earn the "Steppin' Razor" achievement.

Elite Ascetic Body: Earn the "Up Close and Personal" achievement.

Use Anti-Air Wraith:
Requirements: Battle Rifle/Carbine and lots of patience.
All you have to do is eliminate the secondary gunner and then stand on top of the driver. Bash open the hood (melee) until you can see the driver. Then melee the Brute until the helmet is gone (or if the helmet is not on the Brute, then do not melee).

Now comes the hard part. You have to find a spot where it DOES NOT give you the option to board the enemy Wraith (Hold RB...) So for the split second that this does not show, hold RB and shoot the Brute in the head (while still holding RB). You should now board the Wraith once the Brute is dead.

If you were not holding RB while you killed the Brute, the Wraith would most likely explode.

Also, if you get out of the Wraith, it will explode, not allowing you to enter it again.
(supplied by: darkish_raven)

For the Achievment: We're in for some Chop:
You will want to grab this achievment on the level: Tsavo Highway. After meeting up with the pinned Marines, and eliminating the Phantom troops, a Covenant Wraith tank will veer from cover and start attacking, (Make sure to grab a mine before engaging it). When the Wraith gets close enough, deploy the mine directly under the Wraith, sometimes if it doesn't work the first time, another mine should do the trick. Just make sure not to destroy the tank before deploying the mines, it needs to be operational, with the Brute's still inside for it too fully work.
(supplied by: Agamidae)

Easy 'Too close to the sun' Acheivement:
You can get this achievement at the very beginning of the level The Covenant. Save one shot in your spartan laser. After you cleared the area, shoot one of the banshees in the sky with your laser.
(supplied by: PF2K)

Landfall
Reward: 20 Points
Objective: Finish the first mission of the Campaign on Normal, Heroic, or Legendary.

Holdout
Reward: 20 Points
Objective: Finish the second mission of the Campaign on Normal, Heroic, or Legendary.

The Road
Reward: 20 Points
Objective: Finish the third mission of the Campaign on Normal, Heroic, or Legendary.

Assault
Reward: 30 Points
Objective: Finish the fourth mission of the Campaign on Normal, Heroic, or Legendary.

Cleansing
Reward: 30 Points
Objective: Finish the fifth mission of the Campaign on Normal, Heroic, or Legendary.

Refuge
Reward: 30 Points
Objective: Finish the sixth mission of the Campaign on Normal, Heroic, or Legendary.

Last Stand
Reward: 40 Points
Objective: Finish the seventh mission of the Campaign on Normal, Heroic, or Legendary.

The Key
Reward: 40 Points
Objective: Finish the eighth mission of the Campaign on Normal, Heroic, or Legendary.

Return
Reward: 50 Points
Objective: Finish the final mission of the Campaign on Normal, Heroic, or Legendary.

Campaign Complete: Normal
Reward: 125 Points
Objective: Finish the Campaign on Normal.

Campaign Complete: Heroic
Reward: 125 Points
Objective: Finish the Campaign on Heroic (also unlocks achievement for Normal).

Campaign Complete: Legendary
Reward: 125 Points
Objective: Finish the Campaign on Legendary (also unlocks achievements for Normal and Heroic).

Iron
Reward: 10 Points
Objective: Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Black Eye
Reward: 10 Points
Objective: Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Tough Luck
Reward: 10 Points
Objective: Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Catch
Reward: 10 Points
Objective: Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Fog
Reward: 10 Points
Objective: Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Famine
Reward: 10 Points
Objective: Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Thunderstorm
Reward: 10 Points
Objective: Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Tilt
Reward: 10 Points
Objective: Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Mythic
Reward: 10 Points
Objective: Find and claim this skull when playing on Normal, Heroic or Legendary difficulty.

Too Close to the Sun
Reward: 5 Points
Objective: Destroy an enemy banshee with the spartan laser or missile pod in a ranked playlist or in campaign.

We're in for some Chop
Reward: 5 Points
Objective: Destroy an enemy vehicle with equipment in a ranked playlist or in campaign.

Fear the Pink Mist
Reward: 5 Points
Objective: Kill 5 enemies with the needler in a ranked free for all playlist or in campaign.

Headshot Honcho
Reward: 5 Points
Objective: Kill 10 enemies with headshots in a ranked free for all playlist or in campaign.

Used Car Salesman
Reward: 5 Points
Objective: Destroy a vehicle that has three enemies in it in a ranked playlist or in campaign.

Marathon Man
Reward: 40 Points
Objective: Locate and access all Terminals in the Campaign.

Guerilla
Reward: 10 Points
Objective: Score over 15,000 points in the Campaign meta-game on the first mission.

Demon
Reward: 10 Points
Objective: Score over 15,000 points in the Campaign meta-game on the second mission.

Cavalier
Reward: 10 Points
Objective: Score over 15,000 points in the Campaign meta-game on the third mission.

Askar
Reward: 10 Points
Objective: Score over 15,000 points in the Campaign meta-game on the fourth mission.

Exterminator
Reward: 10 Points
Objective: Score over 15,000 points in the Campaign meta-game on the fifth mission.

Ranger
Reward: 10 Points
Objective: Score over 50,000 points in the Campaign meta-game on the sixth mission.

Vanguard
Reward: 10 Points
Objective: Score over 50,000 points in the Campaign meta-game on the seventh mission.

Orpheus
Reward: 10 Points
Objective: Score over 15,000 points in the Campaign meta-game on the eighth mission.

Reclaimer
Reward: 10 Points
Objective: Score over 15,000 points in the Campaign meta-game on the final mission.

MVP
Reward: 5 Points
Objective: Earn the MVP in any ranked playlist (Online).

Maybe Next Time Buddy
Reward: 5 Points
Objective: Board the same vehicle within 10 seconds after being boarded in any free for all playlist (Online).

Killing Frenzy
Reward: 5 Points
Objective: Kill 10 enemies without dying in any ranked free for all playlist (Online).

Steppin' Razor
Reward: 5 Points
Objective: Score a Triple Kill with the sword in a ranked free for all playlist (Online).

Mongoose Mowdown
Reward: 5 Points
Objective: Splatter an enemy with the mongoose in a ranked free for all playlist (Online).

Up Close and Personal
Reward: 5 Points
Objective: Kill 5 enemies by melee or assassination in a ranked free for all playlist (Online).

Triple Kill
Reward: 5 Points
Objective: Kill 3 enemies within 4 seconds of one another in a ranked free for all playlist (Online).

Overkill
Reward: 5 Points
Objective: Kill 4 enemies within 4 seconds of one another in a ranked free for all playlist (Online).

Lee R Wilson Memorial
Reward: 5 Points
Objective: Score 5 grenade sticks in any ranked free for all playlist (Online).

Two for One
Reward: 5 Points
Objective: Score a Double Kill with a single spartan laser shot in a ranked free for all playlist (Online).

Graduate
Reward: 10 Points
Objective: Earn 5 EXP or finish 10 games to complete the requirements for basic training (Online).

UNSC Spartan
Reward: 15 Points
Objective: Earn your Sergeant rating to be recognized as a true Spartan (Online).

Spartan Officer
Reward: 25 Points
Objective: Advance to the Spartan Officer ranks (Online). Total number of Achievements: 79
Online Achievements: 35
Total points: 1750

Double Double
Reward: 25 Points
Objective: On a Legendary map, get two Double Kills during a ranked or social match. (Online)

Came... From... Behind
Reward: 50 Points
Objective: On a Legendary map, get 3 assassinations during a ranked or social match. (Online)

Look Both Ways
Reward: 50 Points
Objective: On a Legendary map, get a Splatter Spree during a ranked or social match. (Online)

Road Rage
Reward: 25 Points
Objective: On a Legendary map, get 5 Warthog chaingun kills during a ranked or social match. (Online)

Alas, Poor Yorick
Reward: 25 Points
Objective: On a Legendary map, get 3 Oddball melee kills during a ranked or social match. (Online)

Defend This
Reward: 50 Points
Objective: On a Legendary map, get a flag melee kill during any ranked or social match. (Online)

Flag Dropped
Reward: 25 Points
Objective: On a Legendary map, get 2 flag carrier kills during any ranked or social match. (Online)

Hammer Time
Reward: 25 Points
Objective: On Assembly, get 5 Hammer kills during any ranked or social match. (Online)

Pull
Reward: 25 Points
Objective: On Citadel, get a Shotgun Spree during any ranked or social match. (Online)

Blades of Fury
Reward: 25 Points
Objective: On Heretic, get a Sword Spree during any ranked or social match. (Online)

Ghost Patrol
Reward: 25 Points
Objective: On Longshore, get 3 kills with a Ghost during any ranked or social match. (Online)

Post Mortem
Reward: 25 Points
Objective: On Orbital, get 2 Death From the Grave medals during any ranked or social match. (Online)

... Get the Horns
Reward: 25 Points
Objective: On a Mythic map, get a Bulltrue medal during any ranked or social match. (Online)

Awww, Too Bad
Reward: 25 Points
Objective: On a Mythic map, get a Killjoy medal during any ranked or social match. (Online)

Killtacular
Reward: 25 Points
Objective: On a Mythic map, get a Killtacular during any ranked or social match. (Online)

Have Fun Respawning
Reward: 25 Points
Objective: On a Mythic map, get an Extermination during any ranked or social match. (Online)

Save This Film
Reward: 25 Points
Objective: On a Mythic map, get a Perfection medal during any ranked or social match. (Online)

Delicious Brains
Reward: 25 Points
Objective: On a Mythic map, infect 2 humans during any ranked or social match. (Online)

Zombie Repeller
Reward: 25 Points
Objective: On a Mythic map, kill 2 Zombies during any ranked or social match. (Online)

Tank Dropper
Reward: 25 Points
Objective: On any Mythic map, get a kill on another player while in monitor mode.

Assembly Skull
Reward: 25 Points
Objective: On Assembly, find the hidden skull.

Citadel Skull
Reward: 25 Points
Objective: On Citadel, find the hidden skull.

Heretic Skull
Reward: 25 Points
Objective: On Heretic, find the hidden skull.

Longshore Skull
Reward: 25 Points
Objective: On Longshore, find the hidden skull.

Orbital Skull
Reward: 25 Points
Objective: On Orbital, find the hidden skull.

Sandbox Skull
Reward: 25 Points
Objective: On Sandbox, find the hidden skull.

Vidmaster Challenge: Brainpan
Reward: 25 Points
Objective: Find all the hidden skulls on the Mythic maps.

Vidmaster Challenge: Annual
Reward: 0 Points
Objective: After 9/25/08, completed Halo on 4-player Legendary LIVE co-op, with Iron, and everyone in Ghosts. (Online)

Vidmaster Challenge: Lightswitch
Reward: 0 Points
Objective: Get to the rank of Lieutenant in any playlist in the new EXP progression system. (Online)

Vidmaster Challenge: 7 on 7
Reward: 0 Points
Objective: Enter into any ranked or social playlist with 7 EXP on the 7th of the month. (Online)