The Harder They Fall
Kill 2 rappelling enemies in a row before they land on their feet in Single Player or Special Ops.
1/2/2011
4:26:26 AM
Rare 30.0%
No Rest For the Wary
Knife an enemy without him ever knowing you were there in Single Player or Special Ops.
12/31/2010
4:36:37 AM
Rare 25.3%
In a Hail of Bullets
Kill 500 enemies with any pistol or revolver in any game mode.
11/8/2010
12:19:29 AM
Rare 10.3%