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.
- Botanist: Collect every seed expansion pack.
- Break On Through: Unlock the Drill Gun.
- Double Your Fun: Unlock the Dual Magnums.
- Get Used To This: Suffer your first Game Over.
- It Always Comes Back: Unlock the B-Uzi.
- It's Fun To Say: Unlock the Back-A-Pack-A-Pult.
- Just Give Up: Get killed by the final boss.
- Patriot: Unlock the Torpeagle Rifle.
- The Easy One: Start the game.
- The Final Stretch: Arrive at the ancient temple.
- Thy Will Be Gun: Defeat the aliens and save all the guns.
- Wrong Choice, Bub: Surrender your guns and embrace peace, you sissy.