| Achievement | How to unlock
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- All for 1up and 1up for all!
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- Bow Before the God of Video Games!
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| - Beat the game on "Impossible" or higher.
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| - Beat the game on "Old School" or higher.
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- On the Naughty List for life
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- That's what friends are for
| - Find all playable characters.
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- Yea... That just happened...
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| - Beat the game on "Normal" or higher.
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| - Beat the game on "Hard as Balls" or higher.
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