Dishonored Death of the Outsider - Big-time Player Trophy / Achievement Guide - Win the auction at Colibron Plaza [Bronze / 30G]

Mission 3
To access the auction, you have to do the optional objective "sedate the bank personnel" in mission 3. This objective is marked from the beginning. Just read the piece of paper on the door of the pharmacy and talk to the girl in the aparments. Then the quest will lead you to the auction.

Once at the auction, use the Semblance skill on the guy smoking in front of the crate by the stairs (approach him from behind so his body drops where enemies can't see it). Semblance will transform you into his body. Now walk to the chairs by the stage, sit down and keep bidding until the auction ends. To bid simply press Square (PS4) / X (Xbox One). The auction ends at 480 coins which also unlocks the trophy / achievement.