Completed the first stage.
Restored the GREEN HILL Stage Gate.
Restored the CHEMICAL PLANT Stage Gate.
Restored the SKY SANCTUARY Stage Gate.
Restored the SPEED HIGHWAY Stage Gate.
Restored the CITY ESCAPE Stage Gate.
Restored the SEASIDE HILL Stage Gate.
Restored the CRISIS CITY Stage Gate.
Restored the ROOFTOP RUN Stage Gate.
Restored the PLANET WISP Stage Gate.
Defeated Death Egg Robot.
Defeated Perfect Chaos.
Defeated Egg Dragoon.
Defeated Metal Sonic.
Collected all the Chaos Emeralds.
Cleared Sonic Generations.
Cleared GREEN HILL Act 1 within one minute.
Got Rank S in an Act.
Got Rank S in three Acts.
Got Rank S in seven Acts.
Got Rank S in twelve Acts.
Got Rank S in all Acts.
Pulled off a seven or more trick combo or six trick combo ending in a finishing trick.
Defeated 100 enemies.
Reached the goal without dropping any of the rings you collected in GREEN HILL Act 1.
Performed all of Sonic's actions in Act 2.
Took no damage from the final boss and cleared the stage.
Completed all Challenge Acts featuring Sonic's friends.
Chatted with all of Sonic's friends you saved.
Joined the rankings.
Participated in a 30 Second Trial.
Found the spring hidden in GREEN HILL Act 1 and reached the goal with a Red Star Ring.
Cleared CHEMICAL PLANT Act 2 without entering the water.
Cleared SKY SANCTUARY Act 1 without falling and losing a life.
Got the Red Star Ring located on the shortcut route in SPEED HIGHWAY Act 2 and reached the goal.
Wrecked 30 or more cars in CITY ESCAPE Act 2.
Got the Red Star Ring located in the hidden room in SEASIDE HILL Act 1 and reached the goal.
Reached the goal in CRISIS CITY Act 2 without being hit by a tornado-carried cars or rocks.
Got the Red Star Ring atop the highest spot in ROOFTOP RUN Act 2 and reached the goal.
Got the Red Star Ring by using an Orange Wisp in PLANET WISP Act 2 and reached the goal.
Cleared a regular stage as Super Sonic.
Got all Skills.
Got all collectibles.
Played Ranking Attack on all stages.
Got all Red Star Rings.
Cleared half the Challenge Acts.
Cleared all the Challenge Acts.