Full list of all 49 Sonic Generations achievements worth 1,000 gamerscore. It takes around 20-25 hours to unlock all of the achievements on Xbox 360.
Race through the first stage.
Restore the GREEN HILL Stage Gate.
Restore the CHEMICAL PLANT Stage Gate.
Restore the SKY SANCTUARY Stage Gate.
Restore the SPEED HIGHWAY Stage Gate.
Restore the CITY ESCAPE Stage Gate.
Restore the SEASIDE HILL Stage Gate.
Restore the CRISIS CITY Stage Gate.
Restore the ROOFTOP RUN Stage Gate.
Restore the PLANET WISP Stage Gate.
Defeat Death Egg Robot.
Defeat Perfect Chaos.
Defeat Egg Dragoon.
Defeat Metal Sonic.
Collect all the Chaos Emeralds.
Clear Sonic Generations.
Clear GREEN HILL Act 1 within one minute.
Get Rank S in an Act.
Get Rank S in three Acts.
Get Rank S in seven Acts.
Get Rank S in twelve Acts.
Get Rank S in all Acts.
Pull off a seven or more trick combo or six trick combo ending in a finishing trick.
Defeat 100 enemies.
Reach the goal without dropping any of the rings you collected in GREEN HILL Act 1.
Perform all of Sonic's moves in Act 2.
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.
Join the rankings.
Participate in a 30 Second Trial.
Find the spring hidden in GREEN HILL Act 1 and reach the goal with a Red Star Ring.
Clear CHEMICAL PLANT Act 2 without entering the water.
Clear SKY SANCTUARY Act 1 without falling and losing a life.
Get the Red Star Ring located on the shortcut route in SPEED HIGHWAY Act 2 and reach the goal.
Wreck 30 or more cars in CITY ESCAPE Act 2.
Get the Red Star Ring located in the hidden room in SEASIDE HILL Act 1 and reach the goal.
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.