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
Perform a perfect combo including all of Batman's combat moves (any play mode)
Complete every challenge in Arkham City
A moment of remembrance
Find someone to play remote Batarang catch with
Obtain all 108 medals on the original Arkham City campaigns (as Batman)
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)
Rescue all the hostages from Riddler
Collect all of Batman's gadgets and upgrades
Track down the serial killer
Jump off the tallest building in Arkham City and glide for 1 minute without touching the ground.
Complete New Game Plus
Rescue the fifth hostage from Riddler
Use 5 different Quickfire gadgets in one fight (any play mode)
Rescue the fourth hostage from Riddler
Reveal the mystery watcher
Stop all assaults in Arkham City
Rescue the third hostage from Riddler
Rescue the second hostage from Riddler
Complete all augmented reality training exercises
Stop the contract operative
Collect enough evidence to locate the gun for hire
Obtain 48 medals on the original Arkham City ranked maps (as Batman)
Reunite the separated couple
Obtain 24 medals on the original Arkham City ranked maps (as Batman)
Stop the phone booth killer
Destroy it all
Rescue the first hostage from Riddler
All the world is a stage
Don't look down
Fight for survival
Time is running out
A deadly game of hide and seek
Complete one combat challenge without taking damage (any character)
We are legion
Uncover the secret of Arkham City
Stop the unstoppable
Last man standing
Complete a combo of 50 moves (any play mode, any character)
Clear the airwaves
Solve the first riddle
Answer a ringing phone
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
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 all 72 medals on the original Arkham City ranked maps (as Catwoman)
Obtain all 108 medals on the original Arkham City campaigns (as Catwoman)
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 Nightwing Bundle Pack campaigns (as Nightwing)
Obtain 78 medals on the original Arkham City and Robin Bundle Pack ranked maps (as Robin)
Obtain 114 medals on the original Arkham City and Robin Bundle Pack campaigns (as Robin)
Defuse all bombs in 3 minutes or less
Use 5 different Quickfire gadgets in one fight as Robin in Harley Quinn's Revenge
Shield Bash 5 different thugs
Zip Kick 5 different thugs
The joke's on who?
Clean up the Dry Docks
Find a way into the secret base
No crimefighter should be without this
Snap Flash an unarmed thug, an armed thug, an environmental object and a Titan
Destroy all Harley Balloons