Full list of all 70 Batman: Arkham City achievements worth 1,500 gamerscore. It takes around 40-50 hours to unlock all of the achievements in the base game.
The base game contains 50 achievements worth 1,000 Gamerscore, and there are 4 DLC packs containing 20 achievements worth 500 Gamerscore.
Have 12 murderous dates with Calendar Man
Obtain all 108 medals on the original Arkham City campaigns (as Batman)
Complete every challenge in Arkham City
Obtain 72 medals on the original Arkham City campaigns (as Batman)
Obtain 36 medals on the original Arkham City campaigns (as Batman)
Obtain all 72 medals on the original Arkham City ranked maps (as Batman)
Complete New Game Plus
Obtain 48 medals on the original Arkham City ranked maps (as Batman)
Stop all assaults in Arkham City
Rescue all the hostages from Riddler
Jump off the tallest building in Arkham City and glide for 1 minute without touching the ground.
Obtain 24 medals on the original Arkham City ranked maps (as Batman)
Rescue the fifth hostage from Riddler
Track down the serial killer
A moment of remembrance
Rescue the fourth hostage from Riddler
All the world is a stage
Don't look down
Collect all of Batman's gadgets and upgrades
Fight for survival
Stop the phone booth killer
Stop the contract operative
Collect enough evidence to locate the gun for hire
Reveal the mystery watcher
Time is running out
Reunite the separated couple
Use 5 different Quickfire gadgets in one fight (any play mode)
A deadly game of hide and seek
Perform a perfect combo including all of Batman's combat moves (any play mode)
Rescue the third hostage from Riddler
Destroy it all
We are legion
Uncover the secret of Arkham City
Stop the unstoppable
Complete a combo of 50 moves (any play mode, any character)
Last man standing
Clear the airwaves
Rescue the second hostage from Riddler
Rescue the first hostage from Riddler
Solve the first riddle
Complete all augmented reality training exercises
Complete one combat challenge without taking damage (any character)
Answer the call for help
Answer a ringing phone
Find someone to play remote Batarang catch with
Hammer the point home
There is only one way in
Save the medical volunteers
Save the damsel, but is she in distress?
Become the Bat
Obtain all 108 medals on the original Arkham City campaigns (as Catwoman)
Obtain all 72 medals on the original Arkham City ranked maps (as Catwoman)
Complete all 40 of the Catwoman Riddler grid items
Retrieve your stolen goods
Steal the score of a lifetime
Drop in on an old friend
Obtain 114 medals on the original Arkham City and Nightwing Bundle Pack campaigns (as Nightwing)
Obtain 78 medals on the original Arkham City and Nightwing Bundle Pack ranked maps (as Nightwing)
Obtain 114 medals on the original Arkham City and Robin Bundle Pack campaigns (as Robin)
Obtain 78 medals on the original Arkham City and Robin Bundle Pack ranked maps (as Robin)
Destroy all Harley Balloons
The joke's on who?
Defuse all bombs in 3 minutes or less
Snap Flash an unarmed thug, an armed thug, an environmental object and a Titan
Clean up the Dry Docks
Find a way into the secret base
No crimefighter should be without this
Shield Bash 5 different thugs
Use 5 different Quickfire gadgets in one fight as Robin in Harley Quinn's Revenge
Zip Kick 5 different thugs