| Achievement | How to unlock
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| Black Hen | Kill 666 Black Hen's.
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| Black Tipped | Score 90% of the notes and beat Sharkmungus on Hard Rock Difficulty.
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| Bull Shark | Score 90% of the notes and beat Sharkmungus on Extreme Difficulty.
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| Compso | Beat Rex on Hard Rock Difficulty.
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| Devastator | Score 90% of the notes and beat Morton on Violent Difficulty.
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| Hammerhead | Score 90% of the notes and beat Sharkmungus on Violence Difficulty.
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| Marlene's Stuff | Find and kill Marlene's shiny.
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| Nuke Machine | Score 90% of the notes and beat Morton on Extreme Difficulty.
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| Raptor | Beat Rex on Violence Difficulty.
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| Rex | Beat Rex on Extreme Difficulty.
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| Tank | Score 90% of the notes and beat Morton on Metal Difficulty.
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| Tiger Shark | Score 90% of the notes and beat Sharkmungus on Metal Difficulty.
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| Triceratops | Beat Rex on Metal Difficulty.
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| Triforce | Reach end of Chapter 3 on any difficulty.
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| War Bike | Score 90% of the notes and beat Morton on Hard Rock Difficulty.
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