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