Alan Wake 2

There are 3 messages from Alan/The Writer in the first episode of the Night Springs DLC called Number One Fan:
1. In the diner where you start after serving customers one will ask for a book recommendation. Go to the back room and there will be a bass statue, click on that.
2. After the first fight in the forest follow the motorcycle trail and to the right off the path there will be a stump with flowers, choose the bottom right option. If you make it to the cabin you’ve gone too far. It’s about halfway between the fight and the cabin.
3. After the scene on the beach you’ll follow the motorcycle trail again and as you go up some stairs a cutscene will start with a deer.

There's only one missable writer messages

The speaking fish (Story)

The first one is at the beginning in the cafe your giving people coffee and grabbing dishes. You will be asked for a book recommendation. Making you go to the back in the storage room and look through your pile of stuff only for the fish to talk to you.

Second (Missable) The Stump - Bad boy's house

The stump is closer to the first house at the beach. The one where you go upstairs to find bad boy. It's mostly located near the rock formations where you go through a narrow way before coming across the house above you on your left. As you have to go uphill to get to the house but on the side of the hill is a formation of trees and the stump lays in there.

Deer (Story)

After falling bad boy once again you will take out a few enemies that's leading up to the writers mansion only for the cutscene to appear and soon after the achievement would pop.

The first message from “the writer” is hear the start of the chapter,once you have spoken to all the customers one will ask about a book recommendation,you will go to grab one for him,when you enter the room out back interact with the desk and the fish on the plaque will start talking to you,the second message is a cut scene near the end of the chapter,it is a cut scene of a deer talking to you,after this cutscene the achievement will pop.