Full list of all 47 Halo 3: ODST achievements worth 1,000 gamerscore. It takes around 25-30 hours to unlock all of the achievements on Xbox 360.
Find the first Medical Kiosk and heal yourself.
Access and download the city map to your VISR.
Kill 5 enemies while using VISR mode.
Get 10 automag headshot kills in any level.
Stun a vehicle with an overcharged plasma pistol and quickly kill the driver.
Get 5 sticky grenade kills in any level.
Plasma Pistol Overcharge and quickly kill 10 Brutes.
Get 10 Needler supercombine kills on any covenant.
Trade weapons with a fellow character.
Finish any level with at least one Skull activated.
Complete Tayari Plaza on Normal, Heroic, or Legendary to unlock a new Firefight character.
Complete Uplift Reserve on Normal, Heroic, or Legendary to unlock a new Firefight character.
Complete Kizingo Blvd. on Normal, Heroic, or Legendary to unlock a new Firefight character.
Complete ONI Alpha Site on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Complete NMPD HQ on Normal, Heroic, or Legendary to unlock a new Firefight character.
Complete Kikowani Station on Normal, Heroic, or Legendary.
Complete Data Hive on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Complete Coastal Highway on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Complete the Campaign on Normal difficulty.
Complete the Campaign on Heroic difficulty.
Complete the Campaign on Legendary to unlock a new Firefight character.
Find the first clue unraveling the mystery.
Find the 3rd clue unraveling the mystery, alone or with another ODST.
Find the final clue unraveling the mystery, alone or with another ODST.
Kill all Wraiths in Uplift Reserve.
Get 10 Rocket kills on Kizingo Boulevard.
Get 10 Spartan Laser kills on ONI Alpha Site.
Get 15 headshot kills on NMPD HQ.
Kill 10 enemies with the Flamethrower on Data Hive.
Killing things that are new and different is bad, alone or with another ODST.
Killing things that are new and different is good, alone or with another ODST.
Find the first Audio Log.
Find 3 Audio Logs, alone or with another ODST.
Find 15 Audio Logs, alone or with another ODST.
Find all Audio Logs, alone or with another ODST.
In Firefight, finish a full round without killing a single enemy.
Score over 200,000 points in Firefight on Crater.
Score over 200,000 points in Firefight on Lost Platoon.
Score over 200,000 points in Firefight on Rally Point.
Score over 200,000 points in Firefight on Security Zone.
Score over 200,000 points in Firefight on Alpha Site.
Score over 200,000 points in Firefight on Windward.
Score over 200,000 points in Firefight on Chasm Ten.
Score over 200,000 points in Firefight on Last Exit.
Finish any level solo on Legendary, on LIVE, with no shots fired or grenades thrown.
In Firefight, on any mission, pass the 4th Set on 4-player Heroic LIVE co-op.
Complete Highway on 4-player Legendary LIVE co-op, with Iron, and no 'Hog or Scorpion.