Successfully complete the indicated task to unlock the corresponding achievement. To view your achievements and stats in Steam, select "Community", "My profile", "View all my games", then the game and view stats.
- Battle-hardened: Complete all single player levels 1-5.
- Elite Unit: Complete all single player levels 1-5 on Elite difficulty.
- Exterminator: Kill 1000 aliens in single player.
- Frag-master: Kill 10 aliens with one frag grenade.
- Hidden Treasure: Find all secret collectibles.
- Immobilised: Stun 10 aliens with one stun grenade.
- Meat Grinder: Kill 250 aliens on any multiplayer Survivor level.
- More Speed, Less Haste: Complete 'Vengeance' single player level on Veteran difficulty in 17 minutes or less.
- Seasoned Squaddie: Complete any multiplayer level.
- Survivor: Stay alive for 8 minutes on any single player Survivor level.
- Tank: Take 500 damage on 'Determination' single player mission without dying.
- The Informed: Collect all the logs throughout the game.
- Time to Party: Complete 3 Co-op Assault multiplayer games.