Knock-knock
Kill 4 enemies with 4 shots during a slow-mo breach in Single Player or Special Ops.
1/10/2010
1:13:17 AM
Rare 15.2%
Professional
Earn all 3 stars in at least 15 different Special Op missions.
1/9/2010
1:33:11 AM
Ultra Rare 3.2%
Steel Fist Master
Defeat 20 enemies with a single punch, after softening them up with gunfire
1/1/2010
10:37:07 PM
Rare 23.2%
