Complete the mission in the airplane graveyard.
Assault Makarov's safe house.
Take back Whiskey Hotel.
Defend Burger Town.
Find Rojas in the Favelas.
Kill at least 10 enemies with one Predator missile in Single Player or Special Ops.
Infiltrate the snowy mountain side base.
Get hand picked for Shepherd's elite squad.
Help train the local militia.
Kill 2 enemies with a single bullet in Single Player or Special Ops.
Kill at least 3 enemies with a single shot from a grenade launcher in Single Player or Special Ops.
Killed 5 enemies by melee or assassination in a ranked free for all playlist.
Intercept a pass intended for Randy Moss. 5 min qtrs, All Pro (no Pro Bowl, no co-op)
Intercept a Tom Brady pass. 5 min qtrs, All Pro (no Pro Bowl, no co-op)
Completed the Campaign on Normal difficulty.
Completed Coastal Highway and unlocked the Last Exit Firefight mission.
Completed Data Hive and unlocked the Chasm Ten Firefight mission.
Completed ONI Alpha Site and unlocked the Alpha Site Firefight mission.
Found the final clue unraveling the mystery, alone or with another ODST.
Completed Kikowani Station on Normal, Heroic, or Legendary.
Completed NMPD HQ and unlocked the Romeo character in Firefight.
Found the 3rd clue unraveling the mystery, alone or with another ODST.
Completed Kizingo Blvd. and unlocked the Mickey character in Firefight.
Completed Uplift Reserve and unlocked the Dutch character in Firefight.
Completed Tayari Plaza and unlocked the Buck character in Firefight.
Got 5 sticky grenade kills in any level.
Found 3 Audio Logs, alone or with another ODST.
Found the first Audio Log.
Traded weapons with a fellow character.
Found the first clue unraveling the mystery.
Accessed and downloaded the city map to your VISR.
Killed 5 enemies while using VISR mode.
Stunned a vehicle with an overcharged plasma pistol and quickly killed the driver.
Plasma Pistol Overcharged and quickly killed 10 Brutes.
Got 10 Needler supercombine kills on any covenant.
Completed the Campaign on Heroic difficulty.
Completed Legendary and unlocked the Dare character in Firefight.
Got 10 Spartan Laser kills on ONI Alpha Site.
On a Mythic map, got a kill on another player while in monitor mode.
On Assembly, found the hidden skull.
On Citadel, found the hidden skull.
On Heretic, found the hidden skull.
On Longshore, found the hidden skull.
On Orbital, found the hidden skull.
On Sandbox, found the hidden skull.
Found all the hidden skulls on the Mythic maps.
Got 10 automag headshot kills in any level.
Found the first Medical Kiosk and healed yourself.
On a Mythic map, got a Bulltrue medal during a ranked or social match.
On a Mythic map, killed 2 Zombies during a ranked or social match.