There are a maximum of 12 Defender achievements worth 750 (200)
3,559 tracked gamers have this game, 40 have completed it (1.12%)
Achieve a score of 15,000 during an Xbox Live CO-OP game.
Unlocked by 480 tracked gamers (13% - TA Ratio = 2.72)
Do you have a question about this achievement? Please post it in the Defender Forum