Rally Tally
Get a rally of at least 25 in a Table Tennis match (AND win the point) in any mode.
12/25/2010
3:26:16 PM
Rare 42.7%
The Collector
Buy every weapon off the walls in a single Zombies game.
12/20/2010
10:29:05 PM
Ultra Rare 1.6%
Vehicular Slaughter
Destroy all enemies on vehicles during the prison break.
12/11/2010
4:52:34 PM
Rare 18.5%
See Me, Stab Me, Heal Me
Fire a Pack-a-Punched Ballistic Knife at a downed ally to revive them from a distance.
12/6/2010
10:15:55 PM
Ultra Rare 4.5%
Frontiersman
Obtain Legendary rank in any Single Player Ambient Challenge.
12/6/2010
2:10:12 AM
Very Rare 7.9%
Friends in High Places
Use a pardon letter with more than $5000 bounty in Single Player.
12/2/2010
10:57:26 PM
Ultra Rare 2.1%
Sally Likes Blood
Demonstrate killer economic sensibilities by taking down 3 enemies with a single bullet.
11/12/2010
1:17:30 AM
Rare 34.9%