Storm the gulag.

Kill 6 enemies in a row using a thermal weapon in Single Player or Special Ops.

Earn 4 stars in Special Ops.

Kill at least 10 enemies with one Predator missile in Single Player or Special Ops.

Kill 10 enemies in a row using akimbo weapons in Single Player or Special Ops.

Get hand picked for Shepherd's elite squad.

Kill at least 3 enemies with a single shot from a grenade launcher in Single Player or Special Ops.

The player has purchased one slot in any Plasmid or Tonic track

The player has defeated the crazed Dr. Steinman

The player has successfully hacked a turret

The player has performed at least one successful hack

The player has shocked an enemy in the water

Killed 10 enemies using objects in the environment