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You need to find various Riddler trophies and interview tapes hidden throughout the entire game. Plus, if you find all of the trophies, interview tapes, and all of the Riddler's challenges you unlock an achievement (I'm guessing there is a trophy on PS3 that's the same). Games Radar has an amazing Riddler challenge walkthrough.

http://www.gamesradar.com/f/batman-arkham-asylum-riddler-guide/a-2009082614217603032

I suggest beating the game first, however, before doing the Riddler's challenges.

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15y ago

What else can I help you with?