Various Steam Achievements

Achievement How to unlock
88 Miles Per Hour Travel through time.
All Stages Clear! Finish the game.
Dr. Eggman Got Served Destroy Dr. Eggman's final machine.
Heavy Metal Defeat Metal Sonic without getting hurt.
Just in Time! Complete the Time Attack mode in under 25 minutes.
Just one hug is enough Get a hug from Amy.
King of the Rings Collect 200 Rings.
Paradise Found Complete a zone in the Good Future.
Saviour of the Planet Destroy all the robot teleporters and Metal Sonic holograms in the past.
Statue Saviour Find the angel statue in Wacky Workbench.
Take the High Road Pass the upper Signpost in Collision Chaos Zone 2.
Treasure Hunter Collect all the Time Stones.