Dementiar

Freeflow Combo 5 Complete a combo of 5 moves (any play mode)

Shocking Rescue Take down Zsasz in the Patient Pacification Chamber

Malpractice Needs More Practice Survive the onslaught from the deformed Joker henchman

Leave No Man Behind Rescue the guards and henchman from the Joker toxin in Decontamination

Born Free Escape from Intensive Treatment to the island surface

Freeflow Combo 10 Complete a combo of 10 moves (any play mode)

Arkham Analyst Solve 5% of Riddler challenges

Just What The Doctors Ordered Save all the doctors in Medical

Daydreamer Survive the nightmare of the Scarecrow's fear gas

Cryptic Investigator Solve 10% of Riddler challenges

Baneful Payback Defeat Bane

Breaking And Entering Gain access to Arkham Mansion after it is locked down by the Joker

Portal Shutdown Successfully shut down the condenser portal.

Recurring Nightmare Face your biggest fears and keep your sanity

Zsasz Cut Down To Size Save Dr. Young from being killed by Victor Zsasz

Solitary Confinement Capture and lock up Harley Quinn

Freeflow Combo 20 Complete a combo of 20 moves (any play mode)

Lateral Thinker Solve 25% of Riddler challenges

Double Trouble Defeat two Titan Henchmen at once

Resist The Fear Conquer the effects of the Scarecrow's fear gas

Crocodile Tears Venture into Killer Croc's lair and come out alive

Excavator Find a buried treasure.

Freakshow Rodeo Ride Titan henchman and knock down 10 thugs (any play mode)

Poisoned Ivy Defeat the giant Titan Ivy plant

Big Bang Complete story mode on Easy difficulty

"Lousy bony fingers!" Get the balloon twister to pop a ballon.

Home Sweet Home Completed Episode 3.

Silence, Fool! Kill a guard ringing a bell.

New Challenger Cleared a challenge.

Craftswoman Craft 5 pieces of Equipment

Mystery Solver Solve 40% of Riddler challenges

Entities Master Was victorious in every battle with the evil entities.

"It's like I'm not happy unless I'm breathing in the thick, black, nauseating fumes..." Talk to Glottis about cravings.

"Scaring the living is technically against the rules, but we all do it." Scare the living a few times.

Mixing Up The Medicines Complete memory sequence 6.

Good Samaritan Complete 3 Missions

Getting Weird Around Here Complete present day mission 3.

"I squeezed down one of these tubes, like a pixie!" Talk to Brennis about how he got to the machine.

Party Pooper KO all the henchmen celebrating your arrival at the party

The Hammer Falls Complete memory sequence 7.

Inconceivable! Complete all challenges.

"Well, I could do something bad right now if that would help." Try to dig up some dirt on Meche.

"Precisamente, amigo." Learn of a nefarious plot.

Adrift Complete memory sequence 8.

Night Glider Glide continuously for over 100m

"Join or Die! Again!" Receive a message from Eva.

The Hekseville Phantom Completed Episode 4.

A New Hope Complete memory sequence 9.

Buried Secrets Complete Chapter 2 in Leon's campaign.

Titular Achievement Earn 10 different titles.