Knock-knock
Kill 4 enemies with 4 shots during a slow-mo breach in Single Player or Special Ops.
9/16/2010
11:00:10 AM
Rare 15.2%
Perkaholics Anonymous!
Survive until round 20 without buying a single Perk. (Map Pack 3 only)
5/15/2010
6:27:46 PM
Ultra Rare 4.7%
Soul Survivor
Reach round 15 in Nazi Zombies without getting revived. (Map Pack 2 only)
4/5/2010
11:33:38 AM
Ultra Rare 4.3%
Blue Ribbon
Complete a 4-player Competitive Co-Op match in 1st place. (Online co-op Only)
2/10/2010
6:47:06 PM
Very Rare 5.2%
No Rest For the Wary
Knife an enemy without him ever knowing you were there in Single Player or Special Ops.
1/31/2010
2:42:25 PM
Rare 25.3%
Professional
Earn all 3 stars in at least 15 different Special Op missions.
1/30/2010
10:47:06 PM
Ultra Rare 3.2%
Look Ma Two Hands
Kill 10 enemies in a row using akimbo weapons in Single Player or Special Ops.
1/22/2010
4:48:28 PM
Rare 12.6%
Operative
Earn all 3 stars in at least 10 different Special Op missions.
1/21/2010
8:24:15 PM
Very Rare 5.6%
Operational Asset
Earn all 3 stars in at least 5 different Special Op missions.
11/15/2009
8:22:43 PM
Very Rare 9.7%
Desperado
Kill 5 enemies in a row using 5 different weapons or attachments in Single Player or Special Ops.
11/15/2009
3:17:33 PM
Rare 21.2%
Unnecessary Roughness
Use a riot shield to beat down an enemy in Single Player or Special Ops.
11/13/2009
9:51:30 PM
Rare 34.5%
Downed but Not Out
Kill 4 enemies in a row while downed in Special Ops.
11/13/2009
9:26:01 PM
Very Rare 5.8%
It Goes to Eleven
Earn at least 1 star in 11 different Special Op missions.
11/13/2009
8:58:48 PM
Rare 17.0%
The Harder They Fall
Kill 2 rappelling enemies in a row before they land on their feet in Single Player or Special Ops.
11/13/2009
8:04:12 PM
Rare 30.0%
Three-some
Kill at least 3 enemies with a single shot from a grenade launcher in Single Player or Special Ops.
11/11/2009
7:25:24 PM
Common 54.5%