Knock-knock
Kill 4 enemies with 4 shots during a slow-mo breach in Single Player or Special Ops.
4/11/2010
4:10:16 PM
Rare 15.2%
Operative
Earn all 3 stars in at least 10 different Special Op missions.
4/11/2010
3:19:55 PM
Very Rare 5.6%
Operational Asset
Earn all 3 stars in at least 5 different Special Op missions.
4/10/2010
5:06:35 PM
Very Rare 9.7%
Blue Ribbon
Complete a 4-player Competitive Co-Op match in 1st place. (Online co-op Only)
3/21/2010
6:15:05 PM
Very Rare 5.2%