Full list of all 60 Batman: Arkham Origins achievements. It takes around 80-100 hours to unlock all of the achievements in the base game on Windows.
The base game contains 50 achievements, and there is 1 DLC pack containing 10 achievements.
Take down 6 different Elites in a match, using 6 different methods as Batman or Robin in multiplayer
Defeat each of the enemy players at least once in a multiplayer match
Earn a level of prestige in multiplayer
Kill a Hero to bring back your entire gang when at 0 reinforcements on a full multiplayer server
Win a round of each map with each faction in multiplayer
As a Hero, defeat 4 Elites within 40 seconds without using melee in multiplayer
Reach max level with the Joker faction in multiplayer
Reach max overall level in multiplayer
Reach max level with the Bane faction in multiplayer
As an Elite, earn 4000 XP in a single multiplayer match
Fully upgrade a weapon in multiplayer
Complete Deathstroke without failing a single counter
Obtain all the medals on Custom maps in Challenge mode
Obtain all medals on the original Ranked Maps in Challenge mode (as Batman)
Obtain all medals on the original Campaign maps in Challenge mode (as Batman)
Finish I Am The Night Mode
Complete New Game Plus
Master the Worst Nightmare Dark Knight track
Complete all Dark Knight challenges
Acquire all upgrades
Take down 100 enemies who didn't know you were there
Use every Freeflow Focus gadget in one combo
Master the Shadow Vigilante Dark Knight track
Obtain all the medals on Combat Training maps
Complete all Most Wanted missions
Collect every collectible
Collect all Enigma items
Complete all Casefiles
Defeat the Joker
Capture all of Black Mask's Assassins
Hear everything Alfred has to say
Use the Batwing to travel to all Fast Travel points
Master the World's Greatest Detective Dark Knight track
Save a life
Successfully battle Shiva without taking any damage
Find the Black Mask
Master the Gotham Protector Dark Knight track
Reach x50 Combo
Who is the Joker?
Complete a Most Wanted entry
Glide 26 miles total
Defeat Deathstroke
Complete a predator encounter without ever being spotted
Complete a predator encounter using only silent takedowns
Decipher one Extortion File
Stop 20 Crime in Progress
Scan 20 Anarky Tags
Glide across Bridge without touching ground
Shut down an entire Tower Network
Identify Black Mask's assassins
Stop Freeze and bring Boyle to justice
Find all Activist tags in Cold, Cold Heart
Free all civilians frozen in cryogenic ice
Perform 3 ice wall takedowns
Get 3 enemies frozen in one attack
Assemble the cryonucleation tunneller - the cryodrill
Receive the Extreme Environment Suit (XE Suit)
Stop Anarky thug operations in South Gotham
Takedown 2 enemies with one stalactite
Take no damage when playing as Bruce Wayne