Halo 3: ODST Cheats

Hints for Halo 3: ODST

Achievements
When You complete each of these achievements You'll receive the allotted gamerscores:

Campaign Complete: Legendary (100 points) - Complete the Campaign on Legendary to unlock a new Firefight character.
Campaign Complete: Normal (100 points) - Complete the Campaign on Normal difficulty.
Campaign Complete: Heroic (100 points) - Complete the Campaign on Heroic difficulty.
Audiophile (75 points) - Find all Audio Logs, alone or with another ODST.
Coastal Highway (50 points) - Complete Coastal Highway on Normal, Heroic, or Legendary to unlock a new Firefighter mission.
Data Hive (50 points) - Complete Data Hive on Normal, Heroic, or Legendary to unlock a new Firefighter mission.
Uplift Reserve (30 points) - Complete Uplift Reserve on Normal, Heroic, or Legendary to unlock a new Firefight character.
Kizingo Boulevard (30 points) - Complete Kizingo Blvd. on Normal, Heroic, or Legendary to unlock a new Firefighter character.
ONI Alpha Site (30 points) - Complete ONI Slpha Site on Normal, Heroic, or Legendary to unlock a new Firefighter mission.
NMPD HQ (30 points) - Complete NMPD HQ on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Tayari Plaza (30 points) - Complete Tayari Plaze on Normal, Heroic, or Legendary to unlock a new Firefight character.
All Ears (30 points) - Find 15 Audio Logs, alone or with another ODST.
Kikiwani Station (30 points) - Complete Kikowani Station on Normal, Heroic, or Legendary.
Vidmaster Challenge: Classic (25 points) - Finish any level solo on Legendary, on LIVE, with no shots fired or grenades thrown.
Vidmaster Challenge: Endure (25 points) - In Firefight, on any mission, pass the 4th Set on 4-player Heroic LIVE co-op.
Vidmaster Challenge: Déjà Vu (25 points) - Complete Highway on 4-player Legendary LIVE co-op, with Iron, and no 'Hog or Scorpion.
Good Samaritan (20 points) - Killing things that are new and different is bad, alone or with another ODST.
Tuned In (15 points) - Find 3 Audio Logs, alone or with another ODST.
Be Like Marty (10 points) - In Firefight, finish a full round without lilling a single enemy.
Firefight: Crater (10 points) - Score over 200,000 points in Firefight on Crater.
Firefight: Lost Platoon (10 points) - Score over 200,000 points in Firefight on Lost Platoon.
Firefight: Windward (10 points) - Score over 200,000 points in Firefight on Windward.
Firefight: Chasm Ten (10 points) - Score over 200,000 points in Firefight on Chasm Ten.
Firefight: Rally Point (10 points) - Score over 200,000 points in Firefight on Rally Point.
Firefight: Security Zone (10 points) - Score over 200,000 points in Firefight on Security Zone.
Firefight: Alpha Site (10 points) - Score over 200,000 points in Firefight on Alpha Site.
Firefight: Last Exit (10 points) - Score over 200,000 points in Firefight on Last Exit.
Junior Detective (10 points) - Find the first clue unraveling the mystery.
Gumshoe (10 points) - Find the 3rd clue unraveling the mystery, alone or with another ODST.
Super Sleuth (10 points) - Find the final clue unraveling the mystery, alone or with another ODST.
Heal Up (5 points) - Find the first Medical Kiosk and heal yourself.
Tourist (5 points) - Access and download the city map to your VISR.
Dark Times (5 points) - Kill 5 enemies while using VISR mode.
Boom, Headshot (5 points) - Get 10 automag headshot kills in any level.
Stunning! (5 points) - Stun a vehicle with an overcharged plasma pistol and quickly kill the driver.
Ewww, Sticky (5 points) - Get 5 sticky grenade kills in any level.
My Clothes! (5 points) - Plasma Pistol Overcharge and qucikly kill 10 Brutes.
Pink and Deadly (5 points) - Get 10 Needler supercombine kills on any covenant.
Trading Down (5 points) - Trade weapons with a fellow character.
Headcase (5 points) - Finish any level with at least one Skull activated.
Dome Inspector : Get 15 headshot kills on NMPD HQ : 5).
I Like Fire (5 points) - Kill 10 enemies with the Flamethrower on Data Hive.
Naughty Naughty (5 points) - Killing things that are new and different is good, alone or with another ODST.
Listener (5 points) - Find the first Audio Log.
Both Tubes (5 points) - Get 10 Rocket kills on Kizingo Boulevard.
Laser Blaster (5 points) - Get 10 Spartan Laser kills on ONI Alpha Site.

Firefight Recon Armor
DARE's Recon Armor: Complete the Campaign on Legendary difficulty, 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
If You complete certain campaign missions tYou'll 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 this one.
Recon Armor: Get all vidmaster achievements.