Here is the full list of all 13 Alien Breed: Impact achievements.
Finished CO-OP Assault level 1,2 or 3 with no player losing a life
Complete "Hydroponics" in Co-op Assault
Completed the Single Player game on Elite difficulty
Finished 'Interface' single player level without using any health packs
Single player completed
Found all secret collectibles
Used all weapons and items in the game
Picked up 100% of the logs
Complete 3 Co-op Assault multiplayer games
Finished a single player level without using any items
Killed 20 aliens in 30 seconds
Killed 50 aliens in a row without taking any damage
Killed a total of 25 aliens in single player