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