| Achievement | How to unlock
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| Ceiling Slaughter | Kill 10 Gnaar on ceiling spikes in Amethystine Depths.
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| Dino's Best Friend | Rescue 3 dinosaurs by destroying their helmets.
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| Exterminator Sam | Kill a Giant Flea in Fireball Fury.
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| Fully Stacked | Create your first 6 gun stack.
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| Getting Serious | Beat the game on any difficulty.
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| Gnaar-body's Fool | Kill over 50 Gnaar in a single level.
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| Golden Boy | Unlock ALL golden guns.
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| Gun Aficionado | Find ALL guns.
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| Gun Collector | Find 16 guns.
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| I Heard You Like Parallax | Find the Monument to Parallax.
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| Laura Who? | Find all secrets.
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| Lumberjack Sam | Kill a Red Biomechanoid with only chainsaws.
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| Man with the Golden Guns | Unlock 2 golden guns.
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| Perfectly Perfect | Find or reach 100% levels, challenges, secrets, guns, and connectors.
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| Quad Power | Find all 4 of any gun type.
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| Quick and Not-so-Dead | Beat any level in under 2 minutes in its entirety.
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| Red Light Rendezvous | Find the Secret Red Light District.
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| Sepulcher Looter | Find 30 Secrets.
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| Seriously Nuts | Clear 8 Challenge levels.
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| Seriously Tough | Clear 2 Challenge levels.
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| Seriously Unstoppable | Clear ALL Challenge levels.
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| Skeletons in the Closet | Find mental's secret closet.
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| Speed Runner | Finish a level from the start at over 100% gameplay speed.
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| Templeton's Buddy | Help Templeton unlock his secret room in Amethystine Depths.
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| Time to Eat the Doughnuts | Eat one Boston Creme or Cannoli.
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| Timeline Correction | Replay any previous level.
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| Treasure Seeker | Find 10 Secrets.
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| Unflinching Sam | Beat any level without dying.
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| Untouchable Sam | Beat any level without getting hurt.
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| White Men Can Jump | Find the Jump Pad.
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