All Movies and Interviews:
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Beat the game once.
Caped Crusader Suit:
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Complete the game on any difficulty.
Dark Knight Suit:
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Complete the game on any difficulty.
Everything in Gallery of Fear:
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Beat the game once.
Two Batmobile Missions:
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Beat the game once.
World’s Greatest Detective Suit:
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Complete the game on any difficulty.
Defeating Ra’s Al Goul:
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To defeat Ra’s Al Goul at the end, make sure you defeat all of the ninjas
that are around him; he will not die until all ninjas are dead.
Also, when Ra’s Al Goul is trying to attack you with the sword, it is
best to use counter.