Full list of all 12 0 day Attack on Earth achievements worth 200 gamerscore. It takes around 8-10 hours to unlock all of the achievements on Xbox 360.
Got shot down 256 times
Earned every rank
Clear the game on Hard in single player mode
Kill 10 Snake enemies
Clear the game on Normal in single player mode
Kill 10 Sandwich enemies
Occupied all control points in CONTROL POINT MODE
Play a CO-OP Mode game
Kill 10 Mosquito enemies
Enter the Main Menu
Kill 100 targets in CO-OP Mode
Cleared the game on Normal difficulty or harder without losing a life