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