A Quiet Place: The Road Ahead

You will get this achievement by collecting all the documents in a single act (chapter).

Act 1:
1/15: Loud natural sounds - after you start the chapter, the document is found on the bench to the right of the closed door.
2/15: Red Cloud Ranch flyer - turn around from #1, and turn slightly right, you will find #2 on a table
3/15: Romantic message - enter the lobby and find the sitting area. The document will be on the couch
4/15: About a vent - turn around from #3; behind the briefcase stockpile, you'll find this one on the desk
5/15: Romantic answer - go upstairs and check the little table on your left
6/15: Radio message note - on the desk, next to the radio station
7/15: Flower picker message - progress through the story, and you'll end up in a bedroom. The note can be found on the side table
8/15: Concerned message - turn around from #7, cross the wrecked wall, and check the side table on your right
9-15/15: Children's drawnings - progress through the story again until you find yourself in the basement. Six documents are pinned to the wall, and one is on the table in the middle of the room

You will also unlock below achievement for collecting all the children's drawnings:


Here's a video solution if you prefer: