Complete the following achievements to unlock Xbox Live Gamerscore points.
Achievement | How to unlock
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City of Assassins (10 points) | Identify Black Mask's assassins.
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Everyone wears masks (15 points) | Find the Black Mask.
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Nobody that matters (15 points) | Who is the Joker?
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One Rule (25 points) | Save a life.
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One eye open (15 points) | Defeat Deathstroke.
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Perhaps sooner, Perhaps later (30 points) | Defeat the Joker.
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