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.
Solve the first riddle
Obtain 72 medals on the original Arkham City campaigns (as Batman)
Have 12 murderous dates with Calendar Man
Perform a perfect combo including all of Batman's combat moves (any play mode)
Obtain all 108 medals on the original Arkham City campaigns (as Batman)
Complete every challenge in Arkham City
Obtain all 72 medals on the original Arkham City ranked maps (as Batman)
Rescue all the hostages from Riddler
Complete New Game Plus
Rescue the fifth hostage from Riddler
Obtain 48 medals on the original Arkham City ranked maps (as Batman)
Stop all assaults in Arkham City
Rescue the fourth hostage from Riddler
Track down the serial killer
Rescue the third hostage from Riddler
Reveal the mystery watcher
Collect all of Batman's gadgets and upgrades
Obtain 36 medals on the original Arkham City campaigns (as Batman)
Use 5 different Quickfire gadgets in one fight (any play mode)
Stop the contract operative
Collect enough evidence to locate the gun for hire
Jump off the tallest building in Arkham City and glide for 1 minute without touching the ground.
Reunite the separated couple
Complete all augmented reality training exercises
All the world is a stage
A moment of remembrance
Don't look down
Fight for survival
Obtain 24 medals on the original Arkham City ranked maps (as Batman)
Stop the phone booth killer
Time is running out
Find someone to play remote Batarang catch with
A deadly game of hide and seek
Rescue the second hostage from Riddler
Destroy it all
We are legion
Uncover the secret of Arkham City
Stop the unstoppable
Last man standing
Clear the airwaves
Rescue the first hostage from Riddler
Answer a ringing phone
Complete one combat challenge without taking damage (any character)
Complete a combo of 50 moves (any play mode, any character)
Hammer the point home
There is only one way in
Answer the call for help
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)
Retrieve your stolen goods
Complete all 40 of the Catwoman Riddler grid items
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
Clean up the Dry Docks
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
Find a way into the secret base
No crimefighter should be without this
Use 5 different Quickfire gadgets in one fight as Robin in Harley Quinn's Revenge
Zip Kick 5 different thugs
Shield Bash 5 different thugs