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