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