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