| Achievement | How to unlock
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|---|
| Agent (15 points) | Unlock the Agent hero.
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| Bomber (30 points) | Kill a Bomber enemy.
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| BrainWorm (30 points) | Kill a BrainWorm enemy.
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| Cop (15 points) | Unlock the Cop hero.
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| Crystal Skull (40 points) | Find a Crystal Skull.
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| Dino (15 points) | Unlock the Dino hero.
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| Flyer (15 points) | Kill a Flyer enemy.
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| General (15 points) | Unlock the General hero.
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| Gentleman (15 points) | Unlock the Gentleman hero.
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| Hippie (15 points) | Unlock the Hippie hero.
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| Hobo (15 points) | Unlock the Hobo hero.
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| Hopper (30 points) | Kill a Hopper enemy.
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| Horned Boss (90 points) | Defeat the Horned Boss.
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| Lunatic (15 points) | Unlock the Lunatic hero.
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| Magnum (15 points) | Buy the Magnum gun.
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| Mime (15 points) | Unlock the Mime hero.
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| Muscled Boss (15 points) | Defeat the Muscled Boss.
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| Ninja (15 points) | Unlock the Ninja hero.
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| Pirate (30 points) | Unlock the Pirate hero.
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| Plasma Pistol (90 points) | Buy the Plasma Pistol gun.
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| Princess (90 points) | Unlock the Princess heroine.
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| Professor (15 points) | Unlock the Professor hero.
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| Punk (90 points) | Unlock the Punk hero.
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| Red Horned (30 points) | Kill a Red Horned enemy.
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| Shotgun (30 points) | Buy the Shotgun gun.
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| Shredder (30 points) | Kill a Shredder enemy.
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| SMG (15 points) | Buy the SMG gun.
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| Track Shooter (30 points) | Kill a Track Shooter enemy.
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| Trucker (15 points) | Unlock the Trucker hero.
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| Turtle Boss (30 points) | Defeat the Turtle Boss.
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| TwinShot (15 points) | Buy the TwinShot gun.
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| Worm (15 points) | Kill a Worm enemy.
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| Zombie (15 points) | Kill a Zombie enemy.
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| Zombie Runner (15 points) | Kill a Zombie Runner enemy.
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| Zombie Shooter (15 points) | Kill a Zombie Shooter enemy.
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| Zombie Turtle (15 points) | Kill a Zombie Turtle enemy.
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