Here is the full list of all 9 Knock-Knock (EU) trophies - there are 5 bronze, 2 silver and 2 gold.
Turned into a doppelganger
Managed to hide succesfully ten times
Chose to lock The Lodger inside the cabin and remain hidden
Remembered the story of the Lost Child
Found five diary pages
Chose to go into the woods
Entered ten haunters
Saw all fragments of reality
Entered a breach