Get all Red Star Rings.

Restore the ROOFTOP RUN Stage Gate.

Defeat Perfect Chaos.

Restore the SEASIDE HILL Stage Gate.

Restore the SPEED HIGHWAY Stage Gate.

Defeat Metal Sonic.

Restore the CHEMICAL PLANT Stage Gate.

Get all collectibles in Shadow Generations.

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

Open all Collection Boxes in White Space.

Clear Shadow Generations.

Defeat Mephiles.

Defeat Metal Overlord.