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