Defeat Egg Dragoon.

Restore the RAIL CANYON Stage Gate.

Restore the ROOFTOP RUN Stage Gate.

Defeat Perfect Chaos.

Restore the SEASIDE HILL Stage Gate.

Restore the SPEED HIGHWAY Stage Gate.

Defeat Metal Sonic.

As Thor, strike down 4 enemies with a single use of God of Thunder.

Restore the GREEN HILL Stage Gate.

Get all collectibles in Sonic Generations.

Get all Skills.

Clear all the Challenge Acts in Sonic Generations.

Take no damage from the final boss and clear the stage in Sonic Generations.