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Steam achievements:
Above and Beyond - Get 10 stars on one level
Admiral - Get at least 100 stars in the campaign
Bot Buster - Win 5 deathmatches with Bots
Captain - Get at least 60 stars in the campaign
Death Proof - Beat every level without dying
DieHard - Beat a level without dying
Ensign - Get at least 40 stars in the campaign
Excavator - Find all secrets in the campaign
First Impressions - Kill 50 enemies
Frenemies - Finish a duel match with a local player
Hidey-Hole - Find a secret area
Maximum Synergy - Complete all levels in COOP
Pacifist - Complete 5 levels without firing a shot
Rookie - Get at least 20 stars in the campaign
Stone Age - Complete a level in the Armless arcade mode
Survivalist - Get at least 4000 points in Survival arcade mode
Synergy - Complete a level in COOP
Xenocide - Kill all enemies in 5 levels
Above and Beyond - Get 10 stars on one level
Admiral - Get at least 100 stars in the campaign
Bot Buster - Win 5 deathmatches with Bots
Captain - Get at least 60 stars in the campaign
Death Proof - Beat every level without dying
DieHard - Beat a level without dying
Ensign - Get at least 40 stars in the campaign
Excavator - Find all secrets in the campaign
First Impressions - Kill 50 enemies
Frenemies - Finish a duel match with a local player
Hidey-Hole - Find a secret area
Maximum Synergy - Complete all levels in COOP
Pacifist - Complete 5 levels without firing a shot
Rookie - Get at least 20 stars in the campaign
Stone Age - Complete a level in the Armless arcade mode
Survivalist - Get at least 4000 points in Survival arcade mode
Synergy - Complete a level in COOP
Xenocide - Kill all enemies in 5 levels