Batman: Arkham City Cheats - Xbox 360

Unlock Any Costume
Press the following buttons while on the Main Menu (after you have selected your save slot):

[Left], [Left], [Down], [Down], [Left], [Left], [Right], [Up], [Up], [Down].

You will get an audio confirmation and when you continue your game, you will get the option to select your favorite skin.

Achievements
Complete each achievement to receive the allotted gamerscore:

Gotham Base Jumper (5) - Jump off the tallest building in Arkham City and glide for 1 minute without touching the ground.
Pay Your Respects (5) - A moment of remembrance.
Story Teller (10) - Have 12 murderous dates with Calendar Man.
Acid Bath (10) - Save the damsel, but is she in distress?
I'm Batman (10) - Become the Bat.
Savior (10) - Save the medical volunteers.
Hide And Seek (25) - A deadly game of hide and seek.
Ghost Train (25) - Fight for survival.
Freefall (25) - Don't look down.
Exit Stage Right (50) - All the world is a stage.
Chimney Sweep (10) - There is only one way in.
One Armed Bandit (10) - Hammer the point home.
Communication Breakdown (10) - Clear the airwaves.
Gladiator (10) - Last man standing.
Wrecking Ball (25) - Stop the unstoppable.
Lost And Found (10) - Uncover the secret of Arkham City.
Sand Storm (25) - We are legion.
Ring Ring (5) - Answer a ringing phone.
Dial Z For Murder (25) - Stop the phone booth killer.
Stop the Clock (15) - Time is running out.
Bargaining Chip (15) - Reunite the separated couple.
Forensic Expert (10) - Collect enough evidence to locate the gun for hire.
Contract Terminated (25) - Stop the contract operative.
Serial Killer (25) - Track down the serial killer.
Mystery Stalker (15) - Reveal the mystery watcher.
Distress Flare (5) - Answer the call for help.
Broken Toys (25) - Destroy it all.
Conundrum (20) - Rescue the first hostage from Riddler.
Mastermind (20) - Rescue the second hostage from Riddler.
Puzzler (30) - Rescue the third hostage from Riddler.
Intellectual (30) - Rescue the fourth hostage from Riddler.
Brainteaser (40) - Rescue the fifth hostage from Riddler.
AR Knight (25) - Complete all augmented reality training exercises.
Fully Loaded (10) - Collect all of Batman's gadgets and upgrades.
Aggravated Assault (10) - Stop all assaults in Arkham City.
IQ Test (10) - Solve the first riddle.
Genius (50) - Rescue all the hostages from Riddler.
Bronze Revenge (10) - Obtain 24 medals on the original Arkham City ranked maps (as Batman).
Campaign Silver (20) - Obtain 72 medals on the original Arkham City campaigns (as Batman).
Campaign Gold (40) - Obtain all 108 medals on the original Arkham City campaigns (as Batman).
Silver Revenge (20) - Obtain 48 medals on the original Arkham City ranked maps (as Batman).
Gold Revenge (40) - Obtain all 72 medals on the original Arkham City ranked maps (as Batman).
Campaign Bronze (10) - Obtain 24 medals on the original Arkham City ranked maps (as Batman).
Flawless Freeflow Fighter 2.0 (5) - Complete one combat challenge without taking damage (any character).
Twice Nightly (75) - Complete New Game Plus.
Catch (5) - Find someone to play remote Batarang catch with.
50x Combo (5) - Complete a combo of 50 moves (any play mode, any character).
Perfect Freeflow 2.0 (5) - Perform a perfect combo including all of Batman's combat moves (any play mode).
Gadget Attack (5) - Use 5 different Quickfire gadgets in one fight (any play mode).
Perfect Knight - Day 2 (75) - Main Story, Side Missions, Upgrades, Collectables, New Game Plus and Riddlers Revenge (as Batman).

Additionally, there are six Catwoman DLC achievements:

Sphinx' Riddle (10) - Complete all 40 of the Catwoman Riddler grid items.
Arkham City Sirens (25) - Drop in on an old friend.
Campaign Kitty (25) - Campaign Kitty.
Pick Pocket (25) - Steal the score of a lifetime.
Family Jewels (40) - Retrieve your stolen goods.
Feline Revenge (25) - Obtain all 72 medals on the original Arkham City ranked maps (as Catwoman).

Additionally, there are two Robin DLC achievements:

Never Stop Looking (20) - You escaped Rifleman Bank Station. Nothing will stop you from finding Megan now.
Factory Zero (70) - You survived The Missing Link using no Praxis kits, weapons, or explosives. Whoa.

Additionally, there are two Nightwing Bundle Pack DLC achievements:

Campaign Nightwing (25) - Obtain 114 medals on the original Arkham City and Nightwing Bundle Pack campaigns (as Nightwing).
Nightwing Revenge (25) - Obtain 78 medals on the original Arkham City and Nightwing Bundle Pack ranked maps (as Nightwing).

New Game+
Beat the story mode on Normal or Hard difficulty.

Hidden Message
Using the Cryptographic Sequencer, locate coordinates 500,900. You will intercept a frequency repeating the number sequence "5-15-9-7-21-18-18-14-3-5-24-15-12-7-22-3-10-5-15-9-22-3-8-25-26-15-16-25-10-15-17-25". To decode, 1 = C, 2 = B, 3 = A, 4 = Z, and so on. Decoded, the message reads "YOU WILL PAY FOR WHAT YOU HAVE DONE TO ME".

Unlock Scarecrow Hideout
Go on top of a boat near the industrial district (the boat should be near two cranes). While on the boat, take out the cryptographic sequencer and use it. Letters will appear instead of the radio stations. Turn the letters until it reads "City Of Terror." A secret passage on the boat will open. Go down into the boat to find hundreds of roaches, a medical order form addressed to Jonathan Crane, and a Scarecrow victim who will squirm if you zoom in on him.

Different Taunt Animation
To make Batman (or any other playable character) execute a "taunt" like they do in the beginning of a challenge map or round, rotate the right analog stick clockwise two or three times. If you execute a taunt before performing a glide kick, the camera will change into the enemy's perspective during the glide kick action (only works for Batman or Robin).