The The Executioner Add-on for The Evil Within has 10 achievements worth 235 gamerscore.
Kill 10 basic Haunted with the chainsaw.
Kill 10 basic Haunted with environmental traps in The Executioner.
Collect all Daughter's Diaries in The Executioner.
Clear the basement of the manor house in The Executioner.
Clear the first and second floors of the manor house in The Executioner.
Use Executions on 20 basic Haunted.
Complete all Torments.
Purchase all items in the Shop.
Clear The Executioner without taking any damage.
Get payback on the cop who took down your predecessor.