Here is the full list of all 10 Eye in the Sky achievements.
Complete co-op campaign level 1
Complete co-op campaign level 2
Complete co-op campaign level 3
Complete co-op campaign level 4
Complete co-op campaign level 5
Complete co-op campaign level 6
Complete co-op campaign level 7
Complete co-op campaign level 8
Complete co-op campaign level 9
Complete co-op campaign level 10