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

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

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

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

Batman: Arkham Asylum Walkthrough Part 54 - Party Pooper