Halo 3: ODST Cheats

Kikiwani Station : Complete Kikowani Station on Normal, Heroic, or Legendary (30)
Data Hive : Complete Data Hive on Normal, Heroic, or Legendary to unlock a new Firefighter mission (50)
Coastal Highway : Complete Coastal Highway on Normal, Heroic, or Legendary to unlock a new Firefighter mission (50)
Campaign Complete: Normal : Complete the Campaign on Normal difficulty (100)
Campaign Complete: Heroic : Complete the Campaign on Heroic difficulty (100)
Campaign Complete: Legendary : Complete the Campaign on Legendary to unlock a new Firefight character (100)
Junior Detective : Find the first clue unraveling the mystery (10)
Gumshoe : Find the 3rd clue unraveling the mystery, alone or with another ODST (10)
Super Sleuth : Find the final clue unraveling the mystery, alone or with another ODST (10)
Wraith Killer : Kill are Wraiths in Uplift Reserve : 5)
Both Tubes : Get 10 Rocket kills on Kizingo Boulevard (5)
Laser Blaster : Get 10 Spartan Laser kills on ONI Alpha Site (5)
Dome Inspector : Get 15 headshot kills on NMPD HQ : 5)
I Like Fire : Kill 10 enemies with the Flamethrower on Data Hive (5)
Good Samaritan : Killing things that are new and different is bad, alone or with another ODST (20)
Naughty Naughty : Killing things that are new and different is good, alone or with another ODST (5)
Listener : Find the first Audio Log (5)
Tuned In : Find 3 Audio Logs, alone or with another ODST (15)
All Ears : Find 15 Audio Logs, alone or with another ODST (30)
Audiophile : Find all Audio Logs, alone or with another ODST (75)
Be Like Marty : In Firefight, finish a full round without lilling a single enemy (10)
Firefight: Crater : Score over 200,000 points in Firefight on Crater (10)
Firefight: Lost Platoon : Score over 200,000 points in Firefight on Lost Platoon (10)
Firefight: Rally Point : Score over 200,000 points in Firefight on Rally Point (10)
Firefight: Security Zone : Score over 200,000 points in Firefight on Security Zone (10)
Firefight: Alpha Site : Score over 200,000 points in Firefight on Alpha Site (10)
Firefight: Windward : Score over 200,000 points in Firefight on Windward (10)
Firefight: Chasm Ten : Score over 200,000 points in Firefight on Chasm Ten (10)
Firefight: Last Exit : Score over 200,000 points in Firefight on Last Exit (10)
Vidmaster Challenge: Classic : Finish any level solo on Legendary, on LIVE, with no shots fired or grenades thrown (25)
Vidmaster Challenge: Endure : In Firefight, on any mission, pass the 4th Set on 4-player Heroic LIVE co-op (25)
Vidmaster Challenge: Déjà Vu : Complete Highway on 4-player Legendary LIVE co-op, with Iron, and no ‘Hog or Scorpion (25)

Firefight Recon Armor
DARE's Recon Armor: Complete the Campaign on Legendary, alone or with another ODST

Firefight Unlockable Characters
Perform the task to unlock characters for use in Firefight mode.
"Buck" Firefight Character: Complete "Tayari Plaza" on Normal or higher.
"Dare" Firefight Character: Complete the Campaign on Legendary difficulty.
"Dutch" Firefight Character: Complete "Uplift Reserve" on Normal or higher.
"Mickey" Firefight Character: Complete "Kizingo Boulevard" on Normal or higher.
"Romeo" Character: Complete "NMPD HQ" on Normal or higher.

Firefight Missions
Complete certain campaign missions to unlock new maps for the Firefight game mode.

Alpha Site: Complete the ONI Alpha Site campaign mission on any difficulty.
Chasm Ten: Complete the Date Hive campaign mission on any difficulty.
Last Exit: Complete the Coastal Highway campaign mission on any difficulty.
Lost Platoon: Complete the Uplift Reserve campaign mission on any difficulty.

Recon Armour
Get all vidmaster achievements from Halo 3 and Halo 3 ODST to unlock.

Recon Armor: Get all vidmaster achievements.