Halo 3: ODST achievements

Got 10 Needler supercombine kills on any covenant.

Killed all Wraiths in Uplift Reserve.

Got 15 headshot kills on NMPD HQ.

Completed the Campaign on Normal difficulty.

Found the final clue unraveling the mystery.

Completed Data Hive and unlocked the Chasm Ten Firefight mission.

Completed Coastal Highway and unlocked the Last Exit Firefight mission.

Got 5 sticky grenade kills in any level.

Completed Kikowani Station on Normal, Heroic, or Legendary.

Completed NMPD HQ and unlocked the Romeo character in Firefight.

Completed ONI Alpha Site and unlocked the Alpha Site Firefight mission.

Completed Kizingo Blvd. and unlocked the Mickey character in Firefight.