| Achievement | How to unlock
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- All Collection Boxes Collected!
| - Open all Collection Boxes in White Space.
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| - Get Rank S in all Acts in Sonic Generations.
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| - Restore the CHAOS ISLAND Stage Gate.
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| - Restore the CHEMICAL PLANT Stage Gate.
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| - Restore the CITY ESCAPE Stage Gate.
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| - Restore the CRISIS CITY Stage Gate.
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| - Take no damage from the final boss and clear the stage in Sonic Generations.
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| - Restore the GREEN HILL Stage Gate.
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| - Restore the KINGDOM VALLEY Stage Gate.
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| - Restore the PLANET WISP Stage Gate.
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- RADICAL HIGHWAY Act 2 Cleared!
| - Clear RADICAL HIGHWAY Act 2.
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| - Restore the RAIL CANYON Stage Gate.
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| - Restore the ROOFTOP RUN Stage Gate.
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- Rocket has been completed...?
| - Deliver all the rocket parts to Orbot and Cubot.
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| - Restore the SEASIDE HILL Stage Gate.
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| - Restore the SKY SANCTUARY Stage Gate.
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- SPACE COLONY ARK Restored!
| - Restore the SPACE COLONY ARK Stage Gate.
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| - Restore the SPEED HIGHWAY Stage Gate.
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| - Restore the SUNSET HEIGHTS Stage Gate.
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- Shadow Generations: (Hedge)Hogging It All Up
| - Get all collectibles in Shadow Generations.
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- Shadow Generations: All Stages Cleared!
| - Clear Shadow Generations.
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- Shadow Generations: Mission Accomplished!
| - Clear all the Challenge Acts in Shadow Generations.
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- Sonic Generations: (Hedge)Hogging It All Up!
| - Get all collectibles in Sonic Generations.
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- Sonic Generations: All Stages Cleared!
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- Sonic Generations: Mission Accomplished!
| - Clear all the Challenge Acts in Sonic Generations.
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| - Collect all the Chaos Emeralds.
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| - Get Rank S in all Acts in Shadow Generations.
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| - Take no damage from the final boss and clear the stage in Shadow Generations.
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- Vanquished Metal Overlord
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