This is the hardest achievement to get in the game, and requires you to read everything there is to read. Readable objects come in two forms: Books that you will open up by moving close to them, and notes you must interact with to read. The books comes in several shapes and sizes, whilst the latter are either flat pieces of paper or rolled up scrolls.
List of books and notes
Ground floor hallway
* Letter on the desk on the right (translation job)
Ground floor living room
* Book on coffee table with sewing machine (plants)
* Book on the middle of long table (tales of the sea)
* Scroll in chest (order list)
* Book by wall with two clocks and painting of a man (pendulum clocks)
* Scroll in bookshelf drawer near floor (book return notice)
Ground floor kitchen
* Note on table with the pans (stew recipe)
* Book on table in middle of the room (the one also read during the cutscene)
Ground floor storage
* Book on crates after falling down (ciphers)
Upper floor hallway
* Scroll on side table with candelabra (empty faces)
Upper floor work room
* Note on middle table (poem)
* Note on side table (flat circle)
Upper floor bedroom
* Note on bedstand (noise from upstairs)
Upper floor hidden room
* Book on left table (diary)
* Book on right table (Lorelai)