In the ship's control room, there is a black and white diagram that shows columns and black dots with each dot labeled with a letter.
Remember the placement and go down belowdecks to the Knotty Pine area of the wall.
Notice the dots match the knots on the wall.
Save your game here so you can retry if needed.
You should spell out J-U-N-E by pressing the corresponding knots in the order needed.
Something like:
Lower left.
Upper right.
Middle top.
Middle bottom.
A panel will open and if this is your first attempt you will get this achievement!