Here is the full list of all 57 It came from space, and ate our brains achievements.
Complete Rooftops (Campaign) on any difficulty
Finish block planet on any difficulty.
Finish block crash site on any difficulty.
Finish block countryside on any difficulty.
Finish with the highest score in a multiplayer game 10 times.
Finish block highway on any difficulty.
Died 123 times.
Finish block industrial on any difficulty.
Revive 5 people using medkits.
Shoot 95471 times.
Reach 75x multiplier.
Finish block navy on any difficulty.
Buy all shotgun upgrades.
Kill 10000 aliens.
Buy all rocketlauncher upgrades.
Buy all laser upgrades.
Use the shield 5 times.
Pick up 100 upgrades dropped by the S.W.A.T. Drone.
Place 5 turrets.
Use the searchlights 5 times.
Reach 50x multiplier.
Finish with the highest score in a multiplayer game.
Buy all plasmagun upgrades.
Kill 7 aliens at once.
Place 15 mines.
Staying alive while other players are waiting to respawn.
Kill an enemy close to a player with one health.
Kill 1338 crawlers.
Finish block city on any difficulty.
Buy all machinegun upgrades.
Kill 1000 aliens.
Finish block hospital on any difficulty.
Buy all pistol upgrades.
Reach 25x multiplier.
Die for the first time.
Finish the first six levels on easy.
Finish the first six levels on medium.
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.
Finish block suburbs on any difficulty.
Finish block scrapyard on any difficulty.
Finish block launchpad on any difficulty.
Finish block ship on any difficulty.
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 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