There is no guide for this game yet. But apparently it is EASY POINTS!

Big Bang - 50 points

Complete story mode on Easy difficulty

Bigger Bang - 50 points

Complete story mode on Normal difficulty

Biggest Bang - 50 points

Complete story mode on Hard difficulty

Party Pooper -10 points

Time to break up this party

Freeflow Combo 20 - 10 points

Complete a combo of 20 moves (any play mode)

Freeflow Combo 40 - 10 points

Complete a combo of 40 moves (any play mode)

Night Glider - 5 points

Glide continuously for over 100m

Rope-A-Dope-A-Dope - 10 points

String up one henchman and drop him to surprise a second (any play mode)

Mano-A-Mano - 10 points

Take on a beast in hand to hand combat

Catch! - 5 points

Catch a Batarang (any play mode)

Freeflow Combo 5 - 5 points

Complete a combo of 5 moves (any play mode)

Freeflow Combo 10 - 5 points

Complete a combo of 10 moves (any play mode)

Freeflow Perfection - 10 points

Perform a perfect combo including all of Batman's combat moves (any play mode)

Freakshow Rodeo - 10 points

Ride a beast and unleash its power

Freeflow Bronze - 10 points

Achieve 8 medals on combat challenges

Freeflow Silver - 25 points

Achieve 16 medals on combat challenges

Freeflow Gold - 50 points

Achieve 24 medals on combat challenges

Predator Bronze - 10 points

Achieve 8 medals on predator challenges

Predator Silver - 25 points

Achieve 16 medals on predator challenges

Predator Gold - 50 points

Achieve 24 medals on predator challenges

Invisible Predator - 10 points

Complete one predator challenge by using only Silent Takedowns and without being detected

Flawless Freeflow Fighter - 10 points

Complete one combat challenge without taking damage

Crack The E Nigma - 20 points

Solve every riddle on the island

Arkham Analyst - 20 points

Solve 5% of Riddler challenges

Cryptic Investigator - 20 points

Solve 10% of Riddler challenges

Lateral Thinker - 20 points

Solve 25% of Riddler challenges

Mystery Solver - 20 points

Solve 40% of Riddler challenges

Conundrum Cracker - 20 points

Solve 55% of Riddler challenges

Mental Athlete - 20 points

Solve 70% of Riddler challenges

Riddle Resolver - 20 points

Solve 85% of Riddler challenges

World's Greatest Detective - 20 points

Solve Arkham's biggest mystery

Perfect Knight - 75 points

100% Complete

Secret Achievements

Shocking Rescue - 10 points

Take down Zsasz in the Patient Pacification Chamber

Leave No Man Behind - 10 points

Rescue the guards and henchman from the Joker toxin in Decontamination

Malpractice Needs More Practice - 10 points

Survive the onslaught from the deformed Joker henchman

Born Free - 10 points

Escape from Intensive Treatment to the island surface

Just What The Doctors Ordered - 10 points

Save all the doctors in Medical

Daydreamer - 10 points

Survive the nightmare of the Scarecrow's fear gas

Baneful Payback - 25 points

Defeat Bane

Breaking And Entering - 10 points

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

Recurring Nightmare - 10 points

Face your biggest fears and keep your sanity

Zsasz Cut Down To Size - 10 points

Save Dr. Young from being killed by Victor Zsasz

Solitary Confinement - 25 points

Capture and lock up Harley Quinn

Double Trouble - 25 points

Defeat two Titan Henchmen at once

Resist The Fear - 50 points

Conquer the effects of the Scarecrow's fear gas

Crocodile Tears - 50 points

Venture into Killer Croc's lair and come out alive

Poisoned Ivy - 50 points

Defeat the giant Titan Ivy plant