Successfully complete the indicated task to unlock the corresponding achievement. To view your achievements and stats in Steam, select "Community", "My profile", "View all my games", then the game and view stats.
- A Golden Wave: Defeat all bosses as Super Sonic.
- All Chaos Emeralds Found!: Collect all seven Chaos Emeralds.
- All Red Star Rings Found!: Collect all Red Star Rings
- All Stages Cleared!: Defeat the final foe and watch the ending.
- Endurance Race: Clear all stages without returning to the World Map.
- I Love Tails: Play as Tails 50 times.
- Metal Sonic Falls: Defeat Metal Sonic in SKY FORTRESS ZONE, Act 1.
- Proof of Speed: Clear SYLVANIA CASTLE ZONE, Act 1 in one minute or less.
- Ring Collector: Beat Special Stage 1 after collecting every Ring.
- Rolling Combo!: Activate the Rolling Combo with Sonic and Tails.
- Tag Partner: Upload a Multiplayer score or time.
- The Adventure Begins: Clear SYLVANIA CASTLE ZONE, Act 1.