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