| Achievement | How to unlock
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| 8-Bit Curious (150 points) | That was no joke! Completed Old-School Mode.
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| Botanist (100 points) | Collected every GunSeed Expansion Pack.
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| Break On Through (40 points) | Defeated Scorchizard and unlocked the Drill Gun.
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| Child Of The 80's (200 points) | You cut your teeth on retro games, didn't you? Mastered Old-School Mode with zero deaths.
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| Double Your Fun (40 points) | Defeated Rhulke and unlocked the Dual Magnums.
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| It Always Comes Back (40 points) | Defeated Fett and unlocked the B-Uzi Boomerang Gun.
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| It's Fun To Say (40 points) | Defeated Dennis and unlocked the Back-A-Pack-A-Pult.
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| Patriot (40 points) | Defeated the Spider Queen and unlocked the Torpeagle Rifle.
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| The Easy One (1 points) | Started the game for the first time.
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| The Final Stretch (34 points) | Pass the Sacred Sands and follow President Eagle into the Temple of Guns.
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| The Toughest GunMen (And GunWomen) (10 points) | Dwayne and Rebecca Scott team up for a co-op mission. Bring a friend to brave GunWorld together!
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| This Thing Sucks (1 points) | Seriously, I know it's huge and cool looking but don't use the knife. It's a gag weapon.
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| You're A Jerk! (10 points) | You left Scott behind! Oh well, she'll be fine.
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