Achieve at least an A Rank and unlock the Crow Launcher

Complete the Game

Defeat all four optional mini-bosses

Upgrade all four weapons

Get a score of 5 or more on the Mermaid Quiz arcade game

Find the magnum revolver

Talk to Arthur when he's waiting in the car

Sit through the entirety of the really annoying countdown show on TV.

Defeat 9-Torg.

Obtain Knifey.

Complete all the hunts provided by Short Tongue in Bogmire Forge.

Defeat 25 Death Marches in combat.