Halo 3: ODST achievements

7.28%
Vidmaster Challenge: Endure
In Firefight, on any mission, passed the 4th Set on 4-player Heroic LIVE co-op.
7.61%
Firefight: Chasm Ten
Scored over 200,000 points in Firefight on Chasm Ten.
8.80%
Firefight: Last Exit
Scored over 200,000 points in Firefight on Last Exit.
8.80%
Firefight: Windward
Scored over 200,000 points in Firefight on Windward.
8.88%
Firefight: Security Zone
Scored over 200,000 points in Firefight on Security Zone.
9.05%
Firefight: Rally Point
Scored over 200,000 points in Firefight on Rally Point.
9.81%
Vidmaster Challenge: Déjà Vu
Completed Highway on 4-player Legendary LIVE co-op, with Iron, and no 'Hog or Scorpion.
11.93%
Naughty Naughty
Killed 10 Engineers in the city at night, alone or with another ODST.
12.18%
Firefight: Crater
Scored over 200,000 points in Firefight on Crater.
12.35%
Firefight: Alpha Site
Scored over 200,000 points in Firefight on Alpha Site.
12.77%
Audiophile
Found all Audio Logs.
12.94%
Firefight: Lost Platoon
Scored over 200,000 points in Firefight on Lost Platoon.