Party Pooper trophy in Batman: Return to Arkham - Arkham Asylum

How to unlock the Party Pooper trophy in Batman: Return to Arkham - Arkham Asylum: KO all the henchmen celebrating your arrival at the party

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Batman Arkham Asylum - Party-Pooper Achievement

Steam Community :: Gids :: 100% Achievement Guide: Batman - Arkham Asylum

I got the platinum trophy for Arkham World! : r/BatmanArkham

The Joker's Party - Batman: Arkham Asylum Guide - IGN

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Can someone give a tip on how to do Party Pooper on Hard? : r/BatmanArkham

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Batman: Arkham Asylum/Achievements & Trophies, Arkham Wiki

The Joker's Party - Batman: Arkham Asylum Guide - IGN