Oh, You've Done This Before
Take down 50 enemies by sticking them with a grenade.
7/4/2011
6:12:57 PM
Rare 14.3%
Over-Achiever
Complete a Custom Campaign mission on every map in either Single Player or Co-Op.
6/7/2011
1:00:02 AM
Very Rare 5.2%
Weapons Specialist
Fully Upgrade All Stats Of Any Weapon In Campaign Mode
6/4/2011
1:07:18 PM
Rare 42.2%