To unlock the Armored Batsuit in Challenge mode, complete the game.
Unlock the following challenges in story mode by finding the corresponding riddler trophies:
CHALLENGE - HOW TO UNLOCK
Shock and Awe - Find the Riddler Trophy for Botanical Gardens Riddle # 24
Survival Tactics - Find the Riddler Trophy for Caves Riddle # 20
Rumble in the Jungle - Find the Riddler Trophy for Caves Riddle # 9
Invisible Predator - Find the Riddler Trophy for Arkham Island, West Riddle #9
Intensive Treatment Extreme - Find the Riddler Trophy for The Penitentiary Riddle# 8
Silent knight (Extreme) - Find the Riddler Trophy for Botanical Gardens Riddle # 29
Sewer Bat Extreme - Find the Riddler Trophy for Intensive Treament Riddle # 30
Record Breaker (Extreme) - Find the Riddler Trophy for Caves Riddle# 19
Shock and Awe (Extreme) - Find the Riddler Trophy for Medical Riddle # 28
Survival Tactics (Extreme) - Find the Riddler Trophy for Mansion Riddle # 29
Rumble in the Jungle (Extreme) - Find the Riddler Trophy for Caves Riddle #23
To display an alternate view, have either the Batclaw, Batarang, or Multibatarang equipped and press L2(aim) + R2(fire).
Finding the Riddler's "?":
Use detective mode to find a piece of a question mark. You need to find both pieces of the "?", then align them onscreen and use Environmental Analysis to solve the riddle.
The Spirit Of Arkham's Mystery chronicle:
After finding all of the "Chronicle or Arkham" hidden pieces or the Riddler's secret maps, there is one more blank chronicle left. Go back to where you found Clayface behind the wall in the penitentiary. Go upstairs where you left Warden Sharp. Notice the scribbling on the floor. Use Environmental Analysis to unlock it.
Poison Ivy's plants:
To destroy Poison Ivy's plants, get up to a high structure such as a building. Then, drop down directly beside it and tear it's heart out. The plant will not have enough time to damage you.
The Joker can be downloaded for free from the Playstation Store. He can be used in Challenge mode.
When fighting a Titan henchman and a group of normal henchmen, stun the Titan and jump on his back. Use him to hit the normal henchmen and increase your combo total.
Frank Boles easter egg:
Visit www.arkhamcare.com in a web browser. Go to the employee login section and enter "12584712" as the guard login number to login as Frank Boles and view information about him.
Go to www.ArkhamCare.com and enter "horowitz".
After you beat the game and watch the credits, one of the following three ending movies will display at random:
Bane's arm will rise out of the water and grab a container of Titan formula
Killer Croc's arm will rise out of the water and grabs a container of Titan formula
Scarecrow's arm will rise out of the water and grab a container of Titan formula
Bane's health meter has three sections. He will occasionally tear a chunk out of the wall out and throw it at you. Tap A twice to evade the throws. When he is about to charge, quick-throw a Batarang by tapping LT. Bane will cover his face and run head-first into the wall. After depleting one section of his health, run up to him while he is stunned and perform a combo. Batman will jump on his back and rip out a hose which supplies his venom. After each time that you do this, henchmen will jump the railings and attack you. Take out the henchmen while dodging Bane's attacks. Repeat this process three times to defeat Bane. Note: If you wait too long between attacks, Bane will recharge his health.
Record Breaker stage in Challenge mode:
After Poison Ivy destroys the Batcave, cross to the three hills to land
on the mainland at Arkham West. Then, go to the second one. There are
two small holes through which you can see cliffs. Through one, you see
the mainland which is directly in front of you after you land on the
second hill. Before doing that, look and grapple over there then go to a
small exterior. There will be a cliff which has no place to land. Glide
onto that location and you will find a trophy which will unlock Record
Breaker in Challenge mode.
"Freeflow Perfection" trophy hint:
Note: This trick requires that Batman is fully upgraded with all combo-based upgrades, etc. This is easily done in the later rounds of the first Challenge, "Intensive Treatment". You must perform the following moves in a single combo, without getting hit, blocked, or allowing the combo counter run out: Quick Batarang (may be optional), Quick Batclaw (may be optional), Punch, Stun, Evade, Counter, Throw, Instant Takedown, Ground Takedown. Note: You can evade as many times as desired to maintain the combo. Start with the Batclaw and follow up with a Batarang. These may not be required, but you may as well throw them so they cannot hinder you. After using the first couple moves listed after those, plus a number of Punches to get your combo meter above 5x, you can perform a Throw. Do not let Batman hit anyone else or you may leave yourself without any opponents to continue the combo. Punch a bit more and Evade as needed, then use the Instant Takedown when becomes available. Before using a Ground Takedown to complete this combo, use some Batarangs to stun anyone else nearby. If it is all clear, execute the Ground Takedown to complete the "perfect" combo.
"Mano-a-mano" trophy hint:
The Proximity Detonation Explosive Gel upgrade is required. In Challenge mode, choose Rumble In The Jungle and fight through the first three rounds, conserving as much health as possible. In round 4, do not engage the Titan until everyone else in the room (other Arkham inmates) has been put down permanently. Do not use a Batarang -- if you hit the Titan with it at all, it voids the trophy. Quickly switch to your Explosive Gel and wait for the Titan to charge at you. Watch out since there is always a chance he will throw a dead body at you first. Dodge the charge, then set one of your own (meaning spray the floor with Explosive Gel; it is best to do it rightafter he rushes at you and make sure you let Batman completely spray the gel). Stand over the area you sprayed if possible. When the Titan charges again, evade and you should hear a loud bang. The explosion does not take much health off the beast at all, but it does not matter. After he takes one big blind haymaker punch move in, continue hammering him with attacks. You can build up a good twelve to fifteen hit combo on him before Batman delivers the knockout blow, earning, you the trophy.
"Night Glider" trophy hint:
In Arkham East, reach the highest point of Arkham Mansion (the clock tower) and glide down.
Batman: Arkham City easter egg:
Enter the Warden's office and go to the back to the room with the Warden's portrait on the far wall. Turn left when you enter the doorway and approach the wooden wall. Destroy one of the wall panels with Explosive Gel and enter the opening to access an unmarked room with a blueprint on the wall. It displays the plans for the relocation of Arkham to Gotham City.
Batman RIP easter egg:
During the last fight with Scarecrow, it shows Batman's gravestone. The grave has the same design as the current comic book series Batman RIP.
Batman: The Killing Joke easter egg:
Prior to the end fight with The Joker, The Joker sends thugs to attack Batman while he watches from a "throne" set on top of mannequins. In the graphic novel, Batman: The Killing Joke, when The Joker has Commissioner Gordon at the carnival, he is sitting on a "throne" atop skeletons.
George Clooney easter egg:
Rescue Cash and the orderly from the Joker's laughing gas, then stand in the main room looking at the smaller room where they were trapped. A ticker will scroll the following garbled message: "Dr. Clooney report to Gynecology.", a reference to George Clooney, who once had the role of Batman.
KnightFall easter egg:
When you lose against Bane, there is a cinematic of him snapping Batman's back over his knee. This is reference to KnightFall book 1, where Bane breaks Batman's spine.
Scarecrow actor easter egg:
Listen to the first Scarecrow interview to hear him talking and mention a Dr. Murphy, and a Dr. Combs will be mentioned by a security guard. Cillian Murphy played Scarecrow in the recent movies and Jeffrey Combs voiced Scarecrow on the later episodes of Batman: The Animated Series.
Three Stooges easter egg:
While doing detective work while searching for Gordon's pipe tobacco, you will hear The Joker paging "Dr. Howard, Dr. Fine, Dr. Howard".
Weapon view hint:
With the Batarang, Batclaw, or Multibatarang equipped, press R2 to aim then L1 to fire the weapon to get a behind-the-projectile view.
"Catch!" trophy hint:
You must catch your own Batarang to unlock this achievement. To do so, head outside and, with the Remote Controlled Batarang upgrade, toss your Batarang. Control it so it returns to Batman.
After solving the Ra's Al Ghul riddle in Dr. Young's Office (scan the toe tag of the cadaver hanging out of the morgue wall), return later in the game and the cadaver will be gone.
Party Pooper - KO all the henchmen celebrating your arrival at the party.
Night Glider - Glide continuously for over 100m.
Rope-a-dope-a-dope - String up one henchman and drop him to surprise a second (any play mode)..
Catch! - Catch a Batarang (any play mode).
Freeflow Combo 5 - Complete a combo of 5 moves (any play mode).
Freeflow Combo 10 - Complete a combo of 10 moves (any play mode).
Freakshow Rodeo - Ride Titan henchman and knock down 10 thugs (any play mode).
Freeflow Bronze - Achieve 8 medals on combat challenges.
Freeflow Silver - Achieve 16 medals on combat challenges.
Predator Bronze - Achieve 8 medals on predator challenges.
Predator Silver - Achieve 16 medals on predator challenges.
Invisible Predator - Complete one predator challenge by using only Silent Takedowns.
Flawless Freeflow Fighter - Complete one combat challenge without taking damage.
Arkham Analyst - Solve 5% of riddler challenges.
Cryptic Investigator - Solve 10% of riddler challenges.
Lateral Thinker - Solve 25% of riddler challenges.
Mystery Solver - Solve 40% of riddler challenges.
Conundrum Cracker - Solve 55% of riddler challenges.
Mental Athlete - Solve 70% of riddler challenges.
Shocking Rescue - Take down Zsasz in the Patient Pacification Chamber.
Leave No Man Behind - Rescue the guards and henchman from the Joker toxin in Decontamination.
Malpractice Needs More Practice - Survive the onslaught from the deformed Joker henchman.
Born Free - Escape from Intensive Treatment to the island surface.
Just What The Doctors Ordered - Save all the doctors in medical.
Daydreamer - Survive the nightmare of the Scarecrow's fear gas.
Breaking And Entering - Gain access to Administration after it is locked down by the Joker.
Recurring Nightmare - Face your biggest fears and keep your sanity.
Zsasz Cut Down To Size - Save Dr. Young from being killed by Victor Zsasz.
Big Bang - Complete story mode on Easy difficulty.
Bigger Bang - Complete story mode on Normal difficulty.
Biggest Bang - Complete story mode on Hard difficulty.
Freeflow Combo 20 - Complete a combo of 20 moves (any play mode).
Freeflow Combo 40 - Complete a combo of 40 moves (any play mode).
Mano-a-mano - Defeat Titan henchman without using Batarangs (any play mode).
Freeflow Perfection - Perform a perfect combo including all of Batman's combat moves (any play mode).
Freeflow Gold - Achieve 24 medals on combat challenges.
Predator Gold - Achieve 24 medals on predator challenges.
Crack The E Nigma - Solve every riddle on the island.
Riddle Resolver - Solve 85% of riddler challenges.
World's Greatest Detective - Spirit of Amadeus Arkham revealed.
Baneful Payback - Defeat Bane.
Solitary Confinement - Capture and lock up Harley Quinn.
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.
Poisoned Ivy - Defeat the giant Titan Ivy plant.
Perfect Knight - 100% Complete.
Platinum Trophy - Earn all Bronze, Silver, and Gold trophies.