Full list of all 18 Knock-Knock achievements worth 1,000 gamerscore. It takes around 8-10 hours to unlock all of the achievements on Xbox One.
Chose to lock The Lodger inside the cabin and remain hidden
Entered ten haunters
Turned into a doppelganger
Managed to hide succesfully ten times
Managed to hide succesfully five times
Managed to hide succesfully
Chose to go into the woods
Saw all fragments of reality
Touched the weeping one
Entered a haunter
Remembered the story of the Lost Child
Found five diary pages
Found a diary page
Saw three fragments of reality
Entered a breach
Turned the light on in every room
Saw a fragment of reality
Turned the light on in a room before a breach opened