Here is the full list of all 12 Sonic The Hedgehog 2 trophies - there are 8 bronze, 3 silver and 1 gold.
Win 10 versus zones in online play.
Play all four multiplayer zones.
Stay in Super Sonic mode for one minute.
Become Super Sonic.
Get all the Chaos Emeralds.
Get one Chaos Emerald.
Beat the game.
Beat the game in under an hour.
Get to the Casino Night Zone.
Beat Chemical Plant Zone 1 in under 45 seconds.
Clear the Emerald Hill Zone 1.
Beat Emerald Hill Zone 1 in under 35 seconds in single-player or co-op mode.