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

Achievements/Trophies - Batman: Arkham Asylum Guide - IGN

Batman: Return to Arkham - Arkham Asylum Trophy Guide & Road Map

Batman: Arkham Asylum/Achievements & Trophies, Arkham Wiki

Party Pooper trophy in Batman: Arkham Asylum

Batman : Arkham Collection - Arkham Asylum / Freeflow Bronze Trophy

Batman: Arkham Asylum - Wikipedia

Trophies - Batman: Arkham Origins Blackgate Guide - IGN

Batman Arkham Asylum Party Pooper trophy

Batman: Arkham Asylum Walkthrough - GameSpot