Kiss the Nyad

Collect all of the Muse Keys

Complete the Challenge of Atlas

Die enough times to get offered Easy mode

Defeat the Desert Sirens

Acquire Medusa’s Gaze

Open a Health Chest when your health meter is already full

Acquire Poseidon’s Rage

Complete "The Last Enemy That Shall Be Destroyed".

Purchase a rare weapon from a gunsmith.

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

Complete "The Gates of El Presidio".