Here is the full list of all 50 Sonic Generations trophies - there are 37 bronze, 10 silver, 2 gold and 1 platinum.
Collect all Trophies.
Take no damage from the final boss and clear the stage.
Get all collectibles.
Get all Skills.
Get all Red Star Rings.
Play Ranking Attack on all stages.
Race through a regular stage as Super Sonic.
Clear Sonic Generations.
Collect all the Chaos Emeralds.
Defeat Egg Dragoon.
Clear all the Challenge Acts.
Complete all Challenge Acts featuring Sonic's friends.
Defeat Silver.
Chat with each of Sonic's friends you have saved.
Restore the PLANET WISP Stage Gate.
Get Rank S in all Acts.
Get the Red Star Ring by using an Orange Wisp in PLANET WISP Act 2 and reach the goal.
Restore the ROOFTOP RUN Stage Gate.
Get the Red Star Ring atop the highest spot in ROOFTOP RUN Act 2 and reach the goal.
Restore the CRISIS CITY Stage Gate.
Reach the goal in CRISIS CITY Act 2 without being hit by a tornado-carried cars or rocks.
Defeat Perfect Chaos.
Clear half the Challenge Acts.
Defeat Shadow.
Restore the SEASIDE HILL Stage Gate.
Get Rank S in twelve Acts.
Perform all of Sonic's moves in Act 2.
Restore the CITY ESCAPE Stage Gate.
Wreck 30 or more cars in CITY ESCAPE Act 2.
Restore the SPEED HIGHWAY Stage Gate.
Get the Red Star Ring located on the shortcut route in SPEED HIGHWAY Act 2 and reach the goal.
Get the Red Star Ring located in the hidden room in SEASIDE HILL Act 1 and reach the goal.
Get Rank S in seven Acts.
Clear CHEMICAL PLANT Act 2 without entering the water.
Pull off a seven or more trick combo or six trick combo ending in a finishing trick.
Defeat Death Egg Robot.
Defeat Metal Sonic.
Restore the SKY SANCTUARY Stage Gate.
Restore the CHEMICAL PLANT Stage Gate.
Clear SKY SANCTUARY Act 1 without falling and losing a life.
Get Rank S in three Acts.
Clear GREEN HILL Act 1 within one minute.
Participate in a 30 Second Trial.
Join the rankings.
Defeat 100 enemies.
Find the spring hidden in GREEN HILL Act 1 and reach the goal with a Red Star Ring.
Restore the GREEN HILL Stage Gate.
Get Rank S in an Act.
Race through the first stage.
Reach the goal without dropping any of the rings you collected in GREEN HILL Act 1.