Achievement | How to unlock
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100% Chemical Free (5,000 experience points) | Complete Chemical Plant without going underwater.
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A Secret Revealed (10,000 experience points) | Find and complete Hidden Palace Zone.
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Beat the Clock (10,000 experience points) | Complete the Time Attack Mode in less than 45 minutes.
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Bop Non-stop (10,000 experience points) | Defeat any boss in 8 consecutive hits without touching the ground.
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Early Bird Special (10,000 experience points) | Collect all the Chaos Emeralds before Chemical Plant.
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Head 2 Head (10,000 experience points) | Win a 2P Versus game against a friend.
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Hit it Big (5,000 experience points) | Get a jackpot on the Casino Night slot machines.
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Metropolis Master (10,000 experience points) | Complete any Metropolis Zone Act without getting hurt.
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Perfectionist (10,000 experience points) | Get a 'Perfect Bonus' by collecting every ring in an Act.
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Quick Run (5,000 experience points) | Complete Emerald Hill Zone Act 1 in under 35 seconds.
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Scrambled Egg (10,000 experience points) | Defeat Dr. Eggman's Boss Attack mode in under 7 seconds.
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Superstar (5,000 experience points) | Complete any Act as Super Sonic.
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