Cash Out is a challenge and achievement/trophy in the Fallout: New Vegas add-on Dead Money.
Walkthrough
Once you're inside the Sierra Madre Vault during the quest Heist of the Centuries and you have made Elijah come down to the vault, wait inside for him to stand in front of the door or when he comes from behind the shield to kill you, then is your chance to kill him. The achievement will appear after he is dead.
Notes
- The achievement picture is similar to the achievement picture of Arizona Killer, except Elijah is under Vault Boy's foot and the background is of the Vault as well as Father Elijah not holding an NCR flag.
- Elijah will only come down if you pass the speech checks - see Heist of the Centuries for the complete walkthrough.
- This achievement can only be achieved in place of Safety Deposit Box. They cannot both be achieved at once.
- The Vault Boy appears to be wielding a Hunting shotgun, though such a weapon is impossible to obtain in Dead Money. This is probably just because the developers did not change the weapon from the one in the Arizona Killer achievement picture.
- The picture is also somewhat similar to the Sneering Imperialist and Black Widow perks.