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