Achievement | How to unlock
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- Baneful Payback ( 25 points )
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| - Escape from Intensive Treatment to the island surface.
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- Breaking And Entering ( 10 points )
| - Gain access to Arkham Mansion after it is locked down by the Joker.
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- Crocodile Tears ( 50 points )
| - Venture into Killer Croc's lair and come out alive.
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| - Survive the nightmare of the Scarecrow's fear gas.
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- Double Trouble ( 25 points )
| - Defeat two Titan Henchmen at once.
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- Just What The Doctors Ordered ( 10 points )
| - Save all the doctors in Medical.
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- Leave No Man Behind ( 10 points )
| - Rescue the guards and henchman from the Joker toxin in Decontamination.
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- Malpractice Needs More Practice ( 10 points )
| - Survive the onslaught from the deformed Joker henchman.
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- Poisoned Ivy ( 50 points )
| - Defeat the giant Titan Ivy plant.
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- Recurring Nightmare ( 10 points )
| - Face your biggest fears and keep your sanity.
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- Resist The Fear ( 50 points )
| - Conquer the effects of the Scarecrow's fear gas.
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- Shocking Rescue ( 10 points )
| - Take down Zsasz in the Patient Pacification Chamber.
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- Solitary Confinement ( 25 points )
| - Capture and lock up Harley Quinn.
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- Zsasz Cut Down To Size ( 10 points )
| - Save Dr. Young from being killed by Victor Zsasz.
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