Website Game-Tuts are claiming to have their hands on the Halo 3: ODST Achievements. The website captured footage of the achievements on an Xbox 360 using a capture card. It is not yet known whether the achievements are genuine though it looks likely.
Note: The achievement list may contain spoilers.
The game contains 47 achievements worth 1000 GamerScore:
Listener – 5 GamerScore
Found the first Audio Log.
Kikowani Station – 30 GamerScore
Completed Kikowani Station on Normal, Heroic or Legendary.
Data Hive – 50 GamerScore
Completed Data Hive and unlocked the Chasm Ten Firefight mission.
Kizingo Boulevard – 30 GamerScore
Completed Kizingo Blvd. and unlocked the Mickey character in Firefight.
ONI Alpha Site – 30 GamerScore
Completed ONI Alpha Site and unlocked the Alpha Site Firefight mission.
NMPD HQ – 30 GamerScore
Completed NMPD HQ and unlocked the Romeo character in Firefight.
Campaign Complete: Legendary – 100 GamerScore
Completed Legendary and unlocked the Dare character in Firefight.
Junior Detective – 10 GamerScore
Found the first clue unravelling the mystery.
Gumshoe – 10 GamerScore
Found the 3rd clue unravelling the mystery, alone or with another ODST.
Coastal Highway – 50 GamerScore
Completed Coastal Highway and unlocked the Last Exit Firefight mission.
Campaign Complete: Normal – 100 GamerScore
Completed the Campaign on Normal difficulty.
Campaign Complete: Heroic – 100 GamerScore
Completed the Campaign on Heroic difficulty.
Boom, Headshot – 5 GamerScore
Got 10 automag headshot kills in any level.
Stunning! – 5 GamerScore
Stunned a vehicle with an overcharged plasma pistol and quickly killed the driver.
Ewww, Sticky – 5 GamerScore
Got 5 sticky grenade kills in any level.
Heal Up – 5 GamerScore
Found the first Medical Kiosk and healed yourself.
Tourist – 5 GamerScore
Accessed and downloaded the city map to your VISR.
Dark Times – 5 GamerScore
Killed 5 enemies while using VISR mode.
Headcase – 5 GamerScore
Finished any level with at least one Skull activated.
Tayari Plaza – 30 GamerScore
Completed Tayari Plaza and unlocked the Buck character in Firefight.
Uplift Reserve – 30 GamerScore
Completed Uplift Reserve and unlocked the Dutch character in Firefight.
My Clothes! – 5 GamerScore
Plasma Pistol Overcharged and quickly killed 10 Brutes.
Pink and Deadly – 5 GamerScore
Got 10 Needler supercombine kills on any covenant.
Trading Down – 5 GamerScore
Traded weapons with a fellow character
Firefight: Security Zone – 10 GamerScore
Scored over 200,000 points in Firefight on Security Zone.
Firefight: Alpha Site – 10 GamerScore
Scored over 200,000 points in Firefight on Alpha Site.
Firefight: Rally Point – 10 GamerScore
Scored over 200,000 points in Firefight on Rally Point.
Firefight: Crater – 10 GamerScore
Scored over 200,000 points in Firefight on Crater.
Firefight: Lost Platoon – 10 GamerScore
Scored over 200,000 points in Firefight on Lost Platoon.
Firefight: Windward – 10 GamerScore
Scored over 200,000 points in Firefight on Windward.
Vidmaster Challenge: Endure – 25 GamerScore
In Firefight, on any mission, passed the 4th Set on 4-player Heroic LIVE co-op.
Vidmaster Challenge: Déjà vu – 25 GamerScore
Completed Highway on 4-player Legendary LIVE co-op, with Iron, and no ‘Hog or Scorpion.
Vidmaster Challenge: Classic – 25 GamerScore
Finished any level solo on Legendary, on LIVE, with no shots fired or grenades thrown.
Firefight: Chasm Ten – 10 GamerScore
Scored over 200,000 points in Firefight on Chasm Ten.
Firefight: Last Exit – 10 GamerScore
Scored over 200,000 points in Firefight on Last Exit.
Be Like Marty – 10 GamerScore
In Firefight, finished a full round without killing a single enemy.
Laser Blaster – 5 GamerScore
Got 10 Spartan Laser kills on ONI Alpha Site.
Dome Inspector – 5 GamerScore
Got 15 headshot kills on NMPD HQ.
Both Tubes – 5 GamerScore
Got 10 Rocket kills on Kizingo Boulevard.
Super Sleuth – 10 GamerScore
Found the final clue unravelling the mystery, alone or with another ODST.
Wraith Killer – 5 GamerScore
Killed all Wraiths in Uplift Reserve
I Like Fire – 5 GamerScore
Killed 10 enemies with the Flamethrower on Data Hive.
All Ears – 30 GamerScore
Found 15 Audio Logs, alone or with another ODST.
Audiophile – 75 GamerScore
Found all Audio Logs, alone or with another ODST.
Tuned In – 15 GamerScore
Found 3 Audio Logs, alone or with another ODST.
Good Samaritan – 20 GamerScore
Killed no Engineers in the city at night during entire campaign, alone or with another ODST.
Naughty Naughty – 5 GamerScore
Killed 10 Engineers in the city at night, alone or with another ODST.