Daymare: 1998

In chapter 3 near the start where you end up in an ally with a pharmacy (save terminal inside) and a bookstore near a path split. You can go either left or right of the book store, go right and follow the path until you see stairs gong down on the left hand side. On the wall is some chalk scribblings, interact with them to unlock the achievement. Below at 5:29 in the video shows the location of this achievement.