Halo 3: ODST achievements

15.85%

Be Like Marty

In Firefight, finished a full round without killing a single enemy.

16.44%

Vidmaster Challenge: Classic

Finished any level solo on Legendary, on LIVE, with no shots fired or grenades thrown.

22.12%

All Ears

Found 15 Audio Logs.

22.63%

Campaign Complete: Legendary

Completed Legendary and unlocked the Dare character in Firefight.

22.71%

My Clothes!

Plasma Pistol Overcharged and quickly killed 10 Brutes.

23.22%

Both Tubes

Got 10 Rocket kills on Kizingo Boulevard.

26.02%

Stunning!

Stunned a vehicle with an overcharged plasma pistol and quickly killed the driver.

26.78%

Good Samaritan

Killed no Engineers in the city at night during entire campaign.

28.81%

I Like Fire

Killed 10 enemies with the Flamethrower on Data Hive.

32.54%

Campaign Complete: Heroic

Completed the Campaign on Heroic difficulty.

35.76%

Laser Blaster

Got 10 Spartan Laser kills on ONI Alpha Site.

39.41%

Headcase

Finished any level with at least one Skull activated.