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