Full list of all 12 Sonic The Hedgehog 3 achievements worth 200 gamerscore. It takes around 2-3 hours to unlock all of the achievements on Xbox 360.
You finished the game.
You scored 80,000 points.
You completed the Icecap Zone.
You finished the Marble Garden Zone.
You collected all seven Chaos Emeralds.
You finished the Hydrocity Zone.
You scored 40,000 points.
You ran across water.
You collected a Chaos Emerald.
You got a blue gumball.
You scored 20,000 points.
You collected 50 rings.