Here is the full list of all 57 It came from space, and ate our brains achievements.
Kill 100000 aliens.
Make 25.000.000 amount of Coins in total.
Place 15 mines.
Use the searchlights 5 times.
Place 5 turrets.
Use the shield 5 times.
Revive 5 people using medkits.
Finish the first six levels on medium.
Finish with the highest score in a multiplayer game 10 times.
Finish the first six levels on hard.
Finish block launchpad on any difficulty.
Finish block scrapyard on any difficulty.
Finish block suburbs on any difficulty.
Finish block industrial on any difficulty.
Finish block navy on any difficulty.
Shoot 95471 times.
Finish the first six levels on easy.
Finish block planet on any difficulty.
Finish the first six levels on insane.
Reach 75x multiplier.
Reach 50x multiplier.
Died 123 times.
Kill 10000 aliens.
Finish block crash site on any difficulty.
Finish block highway on any difficulty.
Buy all rocketlauncher upgrades.
Finish block city on any difficulty.
Buy all laser upgrades.
Buy all plasmagun upgrades.
Reach 25x multiplier.
Buy all machinegun upgrades.
Finish block ship on any difficulty.
Buy all shotgun upgrades.
Finish block countryside on any difficulty.
Finish with the highest score in a multiplayer game.
Pick up 100 upgrades dropped by the S.W.A.T. Drone.
Kill an enemy close to a player with one health.
Buy all pistol upgrades.
Kill 1338 crawlers.
Kill 7 aliens at once.
Kill 1000 aliens.
Finish 6 multiplayer games on insane without dying.
Finish 3 multiplayer games on insane without dying.
Finish block hospital on any difficulty.
Finish 1 multiplayer game on insane without dying.
Die for the first time.
Staying alive while other players are waiting to respawn.
Complete all Campaign levels on Easy
Complete all Campaign levels on Medium
Complete all Campaign levels on Hard
Complete all Campaign levels on Insane
Complete Rooftops (Campaign) on any difficulty
Complete Clinic (Campaign) on any difficulty
Complete Alleys (Campaign) on any difficulty
Complete Sewers (Campaign) on any difficulty
Complete Riverside (Campaign) on any difficulty
Complete Cave (Campaign) on any difficulty