Here is the full list of all 50 Dishonored 2 achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Complete the game without supernatural powers
Side with the Overseers in the Dust District
Listen to the voices of the Sisters of the Oracular Order
Eliminate 6 enemies in less than 1.5 seconds
Complete the game in high chaos
Finish the game with Corvo Attano
Peruse all journals and audiographs by Meagan Foster and Anton Sokolov aboard the Dreadful Wale
Find 3 musical duos across Karnaca, and listen to their songs
Side with the Howlers in the Dust District
Cast Possession once, chaining between human, hound, rat, fish, and bloodfly
Kill an enemy with their own bullet
Score a headshot while sliding
Complete the game in low chaos
Saved your last known family member
Finish the game without being spotted
Finish the game with Emily Kaldwin
Complete the game without killing anyone
Collect all the decorative objects for the Dreadful Wale
Eliminate 10 enemies with Drop Assassination
Pay tribute to Jessamine one last time
Acquire all collectible paintings
Rob Galvani multiple times
Heard Meagan Foster’s story
Took Delilah’s soul
Eliminated Duke Luca Abele
Craft 10 Bonecharms
Find the hidden balcony passageway
Obtain Stilton’s Master Key from under the table, with the guards there conscious & unalerted
Drop from Addermire’s highest point and take out an enemy below
Drain the water to recover a Rune
Find 60% of available loot
Visited the past
Kill Paolo three times
Link 2 characters with Domino just before one kills the other
Crack the Jindosh Lock without finding the solution elsewhere
Eliminate 20 unaware enemies
Found Anton Sokolov in the Clockwork Mansion
Obtain numbered plates for 3 Clockwork Soldiers
Eliminate Jindosh without him ever knowing you were there
Rob a black market shop
Chat with Dr. Hypatia aboard the Dreadful Wale
Dealt with Dr. Alexandria Hypatia
Steal a corpse for Mindy Blanchard
Using the Heart, listen to the secrets of 40 different people
Stop the Grand Guard from pushing someone into the Wall of Light
Reached Karnaca
Finish an entire mission without being spotted
Finish an entire mission with no casualties
Save the Printer of the Dunwall Courier
Recovered your signet ring