| Achievement | How to unlock
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| ACT "Fruit" Aficionado | Collected 600 or more Rings from ACT "Fruit".
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| Aerial Takedown Artist | Used Tails' aerial attack to defeat hundred enemies.
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| All in a Day's Work | Defeated thousand enemies.
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| All-seeing | Used the Purple Emerald power "Vision".
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| BRIDGE ISLAND | Completed
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| Buddy Bond | Cleared a Stage with a friend.
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| CYBER STATION Completed | Cleared all of CYBER STATION.
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| Charge! | Used the Blue Emerald power "Avatar".
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| Crimson Guardian | Used Knuckles' glide to defeat hundred enemies.
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| Distinctive Flair | Used the White Emerald power "Extra".
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| EGG FORTRESS Completed | Cleared all of EGG FORTRESS.
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| FROZEN BASE Completed | Cleared all of FROZEN BASE.
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| Fire! | Used the Red Emerald power "Bullet".
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| Flow Like Water | Used the Light Blue Emerald power "Water".
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| Fruitful Endeavor | Turned Lagoon City's Goal Plate into a pile of fruit.
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| Fruity Frontier | Cleared an ACT "Fruit".
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| GOLDEN CAPITAL Completed | Cleared all of GOLDEN CAPITAL.
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| Gold Enemy Hunter | Defeated the gold enemies in all Stages.
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| Heroic Blue Blur | Used Sonic's Drop Dash to defeat hundred enemies.
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| LAGOON CITY Completed | Cleared all of LAGOON CITY.
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| Medal Maestro | Collected hundred Medals from Bonus Stages.
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| PINBALL CARNIVAL Completed | Cleared all of PINBALL CARNIVAL.
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| PRESS FACTORY Completed | Cleared all of PRESS FACTORY.
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| Prickly Protector | Used Trip's double jump to defeat hundred enemies.
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| Ring Collector | Collected 200 or more Rings when clearing a Stage.
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| Ring King | Collected 10,000 Rings.
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| SAND SANCTUARY Completed | Cleared all of SAND SANCTUARY.
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| SKY TEMPLE Completed | Cleared all of SKY TEMPLE.
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| SPEED JUNGLE Completed | Cleared all of SPEED JUNGLE.
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| Supercharged | Turned super using the seven Chaos Emeralds.
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| Tenderhearted Hammer-wielder | Used Amy's Hammer to defeat hundred enemies.
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| The Gentle Flow of Time | Used the Yellow Emerald power "Slow".
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| Trip's Courage | Cleared Trip's story.
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| Two Birds, One Stone | Used the Goal Plate to reveal the hidden Item Box.
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| Victory Fanfare | Defeated the true boss.
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| Vine Climb | Used the Green Emerald power "Ivy".
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| Whirligig World | Cleared 1 Bonus Stage.
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| Zap Scrap Star | Cleared Zap Scrap in Frozen Base without taking damage.
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