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