Twin-bladed Knife (achievement)

Twin-bladed Knife is an achievement/trophy in Dishonored: Death of the Outsider.

How to Acquire
To unlock this achievement, Billie Lurk has to take the Twin-bladed Knife from the Elevator Vault inside Dolores Michaels Deposit & Loan Bank during the mission The Bank Job. The vault can only be entered if it has been called to the basement or the third floor of the Inner Atrium, or crashed down the shaft by releasing its brakes.