Now that Rocksteady Studios has given us word about what happens when one beats Batman: Arkham City, website Xbox360Achievements.org ups the ante leaking the achievements for the game. It's good that we didn't have to bug Oracle for the answer, but we have to forewarn you is that THIS IS A SPOILER. So, if you don't want to know then don't scroll down. For all you glory-seekers out there, you'll be happy to know that this is for the Xbox 360 and PlayStation 3 versions of the game (we assume):

I'm Batman (10) – Become the Bat
Acid Bath (10) – Save the damsel, but is she in distress?
Savior (10) – Save the medical volunteers
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
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
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
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
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
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
Genius (50) – Rescue all the hostages from Riddler
Bronze Revenge (10) – Obtain 24 medals on the original Arkham City ranked maps (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)
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)
Flawless Freeflow Fighter 2.0 (5) – Complete one combat challenge without taking damage (any character)
Twice Nightly (75) – Complete New Game Plus
Gotham Base Jumper (5) – Jump off the tallest building in Arkham City and glide for one minute without touching the ground
Pay Your Respects (5) – A moment of remembrance
Story Teller (10) – Have 12 murderous dates with Calendar Man
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 five different Quickfire gadgets in one fight (any play mode)
Perfect Knight: Day 2 (75) – Main Story, Side Missions, Upgrades, Collectables, New Game Plus and Riddler's Revenge (as Batman)

Batman: Arkham City is scheduled to save citizens from gaming boredom on October 18, 2011.

[via Xbox360Achievements]