No missable achievements (plus 19 unknown)
Sign in with Steam or Xbox to track your progress, and:
Kill 100 aliens.
Kill an alien with the last bullet of a machine gun or an assault rifle.
Empty all the rounds of a revolver with only deadly shots in less than 5 seconds.
Blow up 8 aliens with one grenade.
Demolish a part of a building with the grenade launcher.
Use every weapon during one game.
Complete the wasteland map.
Kill 1 000 aliens.
Kill an alien boss with the pistol.
Complete the tropical hotel map.
Unlock all perks.
Beat 100 aliens with leg kicks.
Kill 15 boss aliens.
Complete the petrol station map.
Unlock all upgraded weapons.
Unlock all golden weapons.
Blow up 500 aliens with grenades.
Kill 10 000 aliens.
Earn a total of 10 000 credits.