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