The closest thing to a walkthrough would be the in-game quest journal, but we currently don't have a full guide outside the game itself. You might be able to find a fan guide somewhere or you could drop by our Discord and ask for any particular scenes.
The image gallery, most of the unlocks, if you hover over them, will show you what day/time you can unlock that particular secret, it just requires scanning each room of the house until you find the item.
Best of luck with it, though!