Halo 3: ODST achievements

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

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

Found 15 Audio Logs, alone or with another ODST.

Completed Legendary and unlocked the Dare character in Firefight.

Plasma Pistol Overcharged and quickly killed 10 Brutes.

Got 10 Rocket kills on Kizingo Boulevard.

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

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

Killed 10 enemies with the Flamethrower on Data Hive.

Completed the Campaign on Heroic difficulty.

Got 10 Spartan Laser kills on ONI Alpha Site.

Finished any level with at least one Skull activated.