Complete "The Gates of El Presidio".

Kill 500 enemies with any rifle, repeater, or shotgun in any game mode.

Obtain the Elegant Suit.

Complete Twin Rocks, Pike's Basin, and Gaptooth Breach Hideouts in Single Player.

Complete "Exodus in America".

Finish the Ballad. (The Ballad of Gay Tony)

Help Billy get his bike back. (The Lost and Damned)

Kill Zeus

Completely upgrade all weapons

Acquire the Boreas Icestorm

Solve Hera's Gardens

Open the Gates of Tisiphone

Successfully entertain Aphrodite