The The Executioner Add-on for The Evil Within has 10 achievements.
Use Executions on 20 basic Haunted.
Collect all Daughter's Diaries in The Executioner.
Complete all Torments.
Purchase all items in the Shop.
Kill 10 basic Haunted with the chainsaw.
Kill 10 basic Haunted with environmental traps in The Executioner.
Clear the first and second floors of the manor house in The Executioner.
Clear the basement of the manor house in The Executioner.
Clear The Executioner without taking any damage.
Get payback on the cop who took down your predecessor.