This trophy is earned by completing Part:I Suffering.
To obtain this trophy you'll need to progress through the story of the game. And completing the first 6 Episodes of the first Part:
Episode 1: The Coming of a New Dawn
Episode 2: Betrayal and Vengeance
Episode 3: Hell on Gaia
Episode 4: Old Friends, New Enemies
Episode 5: Hollow Victory
Episode 6: Confessions of a Mask
Once you've finished Episode 6, Part:1 should be done and you'll pop this trophy.