Got 10 Needler supercombine kills on any covenant.

Got 5 sticky grenade kills in any level.

Completed Legendary and unlocked the Dare character in Firefight.

Completed the Campaign on Heroic difficulty.

Completed the Campaign on Normal difficulty.

Completed Uplift Reserve and unlocked the Dutch character in Firefight.

Completed Coastal Highway and unlocked the Last Exit Firefight mission.

Completed Data Hive and unlocked the Chasm Ten Firefight mission.

Killed 10 enemies with the Flamethrower on Data Hive.

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.

Found the 3rd clue unraveling the mystery, alone or with another ODST.

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

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

Found 3 Audio Logs, alone or with another ODST.

Traded weapons with a fellow character.

Found the first Audio Log.

Completed Tayari Plaza and unlocked the Buck character in Firefight.

Found the first clue unraveling the mystery.

Accessed and downloaded the city map to your VISR.

Got 10 automag headshot kills in any level.

Killed 5 enemies while using VISR mode.

Found the first Medical Kiosk and healed yourself.

Scored over 200,000 points in Firefight on Crater.

Plasma Pistol Overcharged and quickly killed 10 Brutes.