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 the first six levels on hard.
Finish the first six levels on insane.
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 block planet on any difficulty.
Finish block crash site on any difficulty.
Finish block countryside on any difficulty.
Finish block highway on any difficulty.
Finish with the highest score in a multiplayer game.
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 Cave (Campaign) on any difficulty
Finish block city on any difficulty.
Finish block hospital on any difficulty.
Place 5 turrets.
Shoot 95471 times.
Use the shield 5 times.
Died 123 times.
Kill an enemy close to a player with one health.
Staying alive while other players are waiting to respawn.
Place 15 mines.
Complete Riverside (Campaign) on any difficulty
Use the searchlights 5 times.
Complete Sewers (Campaign) on any difficulty
Buy all laser upgrades.
Buy all rocketlauncher upgrades.
Reach 75x multiplier.
Kill 10000 aliens.
Complete Alleys (Campaign) on any difficulty
Buy all plasmagun upgrades.
Pick up 100 upgrades dropped by the S.W.A.T. Drone.
Complete Clinic (Campaign) on any difficulty
Buy all shotgun upgrades.
Complete Rooftops (Campaign) on any difficulty
Buy all machinegun upgrades.
Reach 50x multiplier.
Kill 1338 crawlers.
Kill 1000 aliens.
Die for the first time.
Buy all pistol upgrades.
Reach 25x multiplier.
Kill 7 aliens at once.
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 with the highest score in a multiplayer game 10 times.
Revive 5 people using medkits.