You unlocked the special ability of Packie's car bomb placement.

You won a multiplayer race without damaging your vehicle too much.

You completed the mission "Museum Piece".

Completely upgrade all weapons

Collect all of the Phoenix Feathers

Save Pandora

Solve Hera's Gardens

Open the Gates of Tisiphone

Successfully entertain Aphrodite

Kill Hercules

Kill Helios

Sever Gaia’s hand