Here is the full list of all 57 It came from space, and ate our brains achievements.
Complete Clinic (Campaign) on any difficulty
Complete Rooftops (Campaign) on any difficulty
Finish block highway on any difficulty.
Place 15 mines.
Kill 10000 aliens.
Finish block navy on any difficulty.
Reach 75x multiplier.
Buy all laser upgrades.
Finish with the highest score in a multiplayer game.
Reach 50x multiplier.
Kill an enemy close to a player with one health.
Staying alive while other players are waiting to respawn.
Buy all shotgun upgrades.
Pick up 100 upgrades dropped by the S.W.A.T. Drone.
Use the searchlights 5 times.
Use the shield 5 times.
Buy all pistol upgrades.
Place 5 turrets.
Kill 1338 crawlers.
Finish block city on any difficulty.
Buy all machinegun upgrades.
Kill 1000 aliens.
Finish block hospital on any difficulty.
Buy all plasmagun upgrades.
Reach 25x multiplier.
Die for the first time.
Died 123 times.
Finish block countryside on any difficulty.
Finish block crash site on any difficulty.
Finish block planet on any difficulty.
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.
Buy all rocketlauncher upgrades.
Kill 100000 aliens.
Kill 7 aliens at once.
Shoot 95471 times.
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 with the highest score in a multiplayer game 10 times.
Finish block industrial on any difficulty.
Finish block suburbs on any difficulty.
Finish block scrapyard on any difficulty.
Finish block launchpad on any difficulty.
Finish block ship on any difficulty.
Revive 5 people using medkits.
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 Alleys (Campaign) on any difficulty
Complete Sewers (Campaign) on any difficulty
Complete Riverside (Campaign) on any difficulty
Complete Cave (Campaign) on any difficulty