Here is the full list of all 52 The Executioner achievements.
The Maid was inspired
The Gamekeeper's Brother was executed
Killed 10 people
Lived up to the eighth day
Had dinner with the Orphan
The Elder was tortured
Lived up to the seventh day
Read all the books
Read the book
Lived up to the sixth day
The Dog was tamed
The Tavern Servant was killed
Lived up to the fifth day
All the house's upgrades were built
The Father's body was buried
Took the Orphan as wife
You tortured the Orphan
Lived up to the fourth day
Worked as nightman 1 time
Visited the anathomical theater of the Doctor
The Gamekeeper was executed
Was beheaded by King
Refused to torture the victim
Lived up to the third day
Executed the Father yourself
Murdered a person
Lived up to the second day
Your Father was Executed by the Assistant
The Orphan was executed
The Orphan was murdered
Studied an occult ritual
Became an occult performer
Fed Father's body to the Dog
Took the Maid's house
The Dog was killed
Let go the Gamekeeper's Brother
The Maid was beaten into submission
Andre was killed
The worm quest was finished for the good of science
The worm quest was finished for the good of occultism
Took a part in the cannibal cultists' rite
The Maid's blood was taken
The Orphan's body was buried
The family secret was revealed
Fought on the Arena
Owes to the Shepherd
Found a secret passage to the Shepherd
Worked as nightman 5 times
Worked as nightman 10 times
Killed 20 people
Victim died in the torture chamber
The victim survived the torture