Here is the full list of all 30 Dishonored: Death of the Outsider achievements worth 1,000 gamerscore.
Had a guard salute you
Made 3 people vomit using a single bottle of Plagued Spirit
Shot a guard in the head with a fountain pen
Pushed an enemy to his demise using Void Strike
Sent someone flying 40 meters using Hook Mines
Used Displace on a marker placed with Foresight and eliminate a target
Finished the game without being detected
Finished the Original Game+
Killed the Outsider
Completed all contracts
Broke 4 Oraculum censers and listened to the prophecies
Collected all Eleuterio Cienfuegos paintings
Stole the audiograph from the gallery without disabling the safeguard floor
Returned the Outsider to the mortal world
Destroyed an Envisioned cultist
Touched the Eye of the Dead God
Recovered the stolen archive
Attended the meeting as Brother Cardoza
Made an enemy explode into pieces using Displace
Emptied the vault without tampering with any security systems, leaving everyone unharmed and asleep
Obtained an ancient weapon
Opened every safe inside the main vault
Sent the vault crashing through the floor
Won the auction at Colibron Plaza
Took both bank vault keys
Dropped Ivan Jacobi through the trapdoor
Listened to what swarms of rats have to say 5 times
Used Semblance to mimic Shan Yun and sing into the microphone
Finished a mission without killing anyone
Freed the assassin Daud