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