| Achievement | How to unlock
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|---|
| - Take down the Sea Rock. It requires balls.
|
| - Teach Sir Meany some manners!
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| - Conquer every level in the game... even the hidden ones.
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| - Cut down Ashley in the graveyard.
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| - Activate a secret warp gate.
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| - Defeat MacReady in the final confrontation.
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| - Beat the the game on professional difficulty.
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