18 achievements for 1000 Gamerscore
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No Way? No Way!
Collected all gold medallions in Bonus stage
100 Gamerscore
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Full Medal Jacket
Collected all silver medallions in Bonus stage
75 Gamerscore
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Magnificent Seven
Collected all seven Chaos Emeralds
75 Gamerscore
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See You Next Game
Beat the game (any ending)
50 Gamerscore
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Superstar
Spun a Star Post 10 times by going fast
50 Gamerscore
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That's a Two-fer
Uncovered two item boxes with a single Goal Plate
50 Gamerscore
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Now It Can't Hurt You Anymore
Burnt a log bridge in Green Hill Zone
50 Gamerscore
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Triple Trouble
Got a 3 chain combo in Chemical Plant Act 2 or in Mean Bean mode
50 Gamerscore
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The Most Famous Hedgehog in the World
Had Shutterbug take 10 photos
50 Gamerscore
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Window Shopping
Flown through a ship window in Flying Battery Zone Act 2
50 Gamerscore
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Crate Expectations
Found the hidden room in Press Garden Zone and destroyed all breakable crates as Sonic
50 Gamerscore
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King of Speed
Got to the Stardust Speedway Zone Act 2 tower in under a minute
50 Gamerscore
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Boat Enthusiast
Found and rode all the boats in Hydrocity Zone Act 1
50 Gamerscore
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The Password is "Special Stage"
Found the barrel that leads to a Special Ring in Mirage Saloon Zone Act 2
50 Gamerscore
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Secret Sub
Found the secret submarine in Oil Ocean Zone Act 2
50 Gamerscore
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Without a Trace
Defeated a Rexon with the Walker Legs in Lava Reef Zone
50 Gamerscore
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Collect 'Em All
Activated and destroyed eight simultaneous Eggmins during Metallic Madness Zone Act 2
50 Gamerscore
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Professional Hedgehog
Beat Titanic Monarch Zone Act 1 without taking a single hit
50 Gamerscore