Complete Angel Island Zone

Complete Hydrocity Zone

Complete Marble Garden Zone

Complete Carnival Night Zone

Complete Ice Cap Zone

Complete Launch Base Zone

Complete Mushroom Hill Zone

Complete Flying Battery Zone

Complete Sandopolis Zone

Complete Lava Reef Zone

Defeat Knuckles in Hidden Palace Zone as Sonic and/or Tails

Complete Sky Sanctuary Zone as Sonic and/or Tails

Complete Death Egg Zone

Beat the game as Sonic

Beat the game as Sonic with all 14 Emeralds collected

Beat the game as Knuckles

Beat the game as Knuckles with all 14 Emeralds collected

Beat the game as Tails

Beat the game as Tails with all 14 Emeralds collected

Complete Angel Island Zone Act 1 in under 2 minutes

Complete Launch Base Zone Act 2 with at least 100 rings

Complete Mushroom Hill Zone Act 1 in under 3 minutes with a Bubble Shield

Complete Sandopolis Zone Act 2 with a Flame Shield

Complete Lava Reef Zone Act 2 as Sonic and/or Tails with an Electric Shield

Reach 100 rings in The Doomsday Zone

Get a Perfect in a Special Stage

Collect a Chaos Emerald

Collect all 7 Chaos Emeralds

Collect all 7 Super Emeralds

Collect 100 rings

Collect 200 rings

Earn exactly 10 lives

Earn exactly 20 lives

Complete Azure Lake in under 0'30"00 in Competition Mode

Complete Balloon Park in under 0'50"00 in Competition Mode

Complete Chrome Gadget in under 0'45"00 in Competition Mode

Complete Desert Palace in under 0"40"00 in Competition Mode

Complete Endless Mine in under 1'00"00 in Competition Mode

Complete Grand Prix in under 4'00"00 in Competition Mode

Find the hidden 1-Up monitor in Angel Island Zone Act 2 on Sonic's path

Hit the jackpot in the Slot Machine bonus stage

Go off the top of the screen in the Glowing Spheres bonus stage

Go off the top of the screen in Mushroom Hill Zone

Complete Special Stage 1 with a Perfect by going backwards without pausing

Change shields 5 times in the Gumball Machine bonus stage

From the start of Death Egg Zone Act 1, reach Giant Eggman Robo in Act 2 without dying, entering a bonus stage, or transforming into Super/Hyper form

Find the hidden area in Ice Cap Zone Act 2 containing 48 rings and a Giant Ring

Complete an Act with 9 minutes and 59 seconds on the timer

Complete Launch Base Zone Act 1 or 2 without pressing Left

Complete an Act with at least 400 rings

Find the trapezoid of 90 rings in Hydrocity Zone Act 1

Complete Marble Garden Zone Act 1 without taking damage, entering a bonus stage, or transforming into Super/Hyper form

Activate Level Select or Debug Mode - this will block ALL other achievements!