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