Overheat
Kill 50 Chimera by detonating their heatstacks in the Single Player Campaign
6/5/2013
6:27:09 PM
Rare 25.6%
Hell's Serenader
Achieved the maximum rating (excellent) in one of the musical instrument mini-games.
1/2/2013
9:21:12 PM
Rare 39.2%
Variety
Use the secondary fire of each weapon in the Single Player Campaign
12/31/2012
11:58:49 PM
Rare 45.0%
Indiscriminate
Kill an enemy with every weapon in the Single Player Campaign
12/31/2012
6:52:38 PM
Rare 48.8%
