Three-some
Kill at least 3 enemies with a single shot from a grenade launcher in Single Player or Special Ops.
11/11/2009
4:23:36 PM
Common 54.5%
Two Birds with One Stone
Kill 2 enemies with a single bullet in Single Player or Special Ops.
11/11/2009
4:16:01 PM
Common 57.6%
Run-and-Gunner
Defeat 20 enemies by shooting from the hip (without aiming with L1)
10/28/2009
9:45:48 PM
Rare 21.3%
Bare-knuckle Expert
Defeat ten enemies in a row with hand-to-hand combat
10/28/2009
9:36:31 PM
Rare 22.5%
Grenade Hangman
Defeat ten enemies with grenades by aiming while hanging
10/28/2009
9:31:17 PM
Very Rare 9.1%