Won't Let You Die
Use a "Healing Core" 5 times to recover the health of a dying support character.
4/10/2011
4:45:58 PM
Rare 23.2%
Three in the Black
Successfully perform a Perfect Sub Weapon Seize three times on one boss.
4/9/2011
4:40:07 PM
Rare 22.9%
Nowhere to Hide
Tag and kill 30 enemies with the Bullseye secondary fire in the single player Campaign.
3/24/2011
1:46:13 PM
Rare 15.4%
For Close Encounters
Get 10 one-hit head-shot kills with the shotgun in the single player Campaign.
3/24/2011
1:30:30 PM
Rare 22.1%