How to Acquire
To unlock this achievement, Billie Lurk must send the Elevator Vault at the Dolores Michaels Deposit & Loan Bank crashing down its shaft, in the mission The Bank Job. To do so, Dolores Michaels' Vault Key and the Vault Brake Lever must be acquired, then the vault's four brakes released.
First enter Michaels' office on the third floor of the Inner Atrium. Open her secret vault by pushing the button behind her desk, then steal her Vault Key. Then, enter the stairs' elevator shaft through the service access and climb to the top floor. The Vault Brake Lever can be found in a drawer in the room guarded by an Arc Pylon. Once acquired, climb down the service hatch to the top of the Elevator Vault. Open the panels of each of the brake coupling and use the lever to set them free. Once the fourth is released, the vault will be sent down the shaft, crashing through the floor.