| Achievement | How to unlock
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- (Hedge)Hogging It All Up!
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| - Participated in a 30 Second Trial.
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| - Got the Red Star Ring atop the highest spot in ROOFTOP RUN.
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| - Performed all of Sonic's actions in Act 2.
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| - Cleared sonic generations.
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| - Got Rank S in acts seven times.
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| - Got Rank S in acts 12 times.
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| - Completed all of Sonic's friends' Challenges.
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| - Took no damage while defeating the final boss.
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| - Restored the CHEMICAL PLANT Stage Gate.
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| - Restored the CITY ESCAPE Stage Gate.
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| - Got the Red Star Ring by using an Orange Wisp in PLANET WISP.
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| - Restored the CRISIS CITY Stage Gate.
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| - Wrecked 30 or more cars in city escape.
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| - Cleared Green Hill within one minute.
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| - Restored the GREEH HILL stage Gate.
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| - Cleared half the missions.
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| - Found the spring hidden in GREEN HILL Act 1 and reached the goal with a Red Star Ring.
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| - Reached the goal in CRISIS CITY without being hit by a tornado-carried car.
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| - Cleared all the missions.
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| - Restored the PLANET WISP Stage Gate.
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| - Reached the goal without dropping any of the rings you collected in GREEN HILL Act 1.
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| - Restored the ROOFTOP RUN Stage Gate.
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| - Restored the SEASIDE HILL Stage Gate.
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| - Got the Red Star Ring located in the hidden room in SEASIDE HILL.
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| - Got Rank S in acts three times.
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| - Restored the SKY SANCTUARY Stage Gate.
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| - Restored the SPEED HIGHWAY Stage Gate.
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| - Defeated death egg robot.
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| - Cleared a regular stage as Super Sonic.
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| - Got the Red Star Ring located on the shortcut route in SPEED HIGHWAY.
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| - Completed the first stage.
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| - Played Time Attack on all stages.
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| - Collected all the Chaos Emeralds.
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| - Executed a trick with a seven-step combo or longer.
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| - Cleared SKY SANCTUARY without falling even once.
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| - Cleared CHEMICAL PLANT without entering the water.
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| - Chatted with all of Sonic's friends you saved.
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