Here is the full list of all 12 Sonic The Hedgehog trophies - there are 7 bronze, 4 silver and 1 gold.
Beat the game in under 40 minutes.
Beat Marble Zone Act 1 in under 80 seconds.
Beat the game without dying.
Beat the game.
Get to the Star Light Zone.
Get to the Labyrinth Zone.
Get all the Chaos Emeralds.
Get to the Spring Yard Zone.
Beat Green Hill Zone Act 1 in under 35 seconds.
Clear the Green Hill Zone.
Get one Chaos Emerald.
Get 100 or more rings.