Collect all Trophies.
Restore the CRISIS CITY Stage Gate.
Restore the ROOFTOP RUN Stage Gate.
Restore the PLANET WISP Stage Gate.
Defeat Egg Dragoon.
Defeat Silver.
Collect all the Chaos Emeralds.
Clear Sonic Generations.
Clear GREEN HILL Act 1 within one minute.
Get Rank S in all Acts.
Take no damage from the final boss and clear the stage.
Complete all Challenge Acts featuring Sonic's friends.
Chat with each of Sonic's friends you have saved.
Clear CHEMICAL PLANT Act 2 without entering the water.
Reach the goal in CRISIS CITY Act 2 without being hit by a tornado-carried cars or rocks.
Get the Red Star Ring atop the highest spot in ROOFTOP RUN Act 2 and reach the goal.
Get the Red Star Ring by using an Orange Wisp in PLANET WISP Act 2 and reach the goal.
Race through a regular stage as Super Sonic.
Get all Skills.
Get all collectibles.
Play Ranking Attack on all stages.
Get all Red Star Rings.
Clear half the Challenge Acts.
Clear all the Challenge Acts.
Defeat Perfect Chaos.
Defeat Shadow.
Get Rank S in twelve Acts.
Restore the SEASIDE HILL Stage Gate.
Get the Red Star Ring located in the hidden room in SEASIDE HILL Act 1 and reach the goal.
Restore the CITY ESCAPE Stage Gate.
Wreck 30 or more cars in CITY ESCAPE Act 2.
Get the Red Star Ring located on the shortcut route in SPEED HIGHWAY Act 2 and reach the goal.
Perform all of Sonic's moves in Act 2.
Restore the SPEED HIGHWAY Stage Gate.
Get Rank S in seven Acts.
Defeat Death Egg Robot.
Defeat Metal Sonic.
Restore the SKY SANCTUARY Stage Gate.
Clear SKY SANCTUARY Act 1 without falling and losing a life.
Restore the CHEMICAL PLANT Stage Gate.
Get Rank S in three Acts.
Pull off a seven or more trick combo or six trick combo ending in a finishing trick.
Participate in a 30 Second Trial.
Join the rankings.
Defeat 100 enemies.
Get Rank S in an Act.
Reach the goal without dropping any of the rings you collected in GREEN HILL Act 1.
Find the spring hidden in GREEN HILL Act 1 and reach the goal with a Red Star Ring.
Restore the GREEN HILL Stage Gate.
Race through the first stage.