Here is my 100% Achievement guide and full walkthrough for Tell Me Why (Chapter 2).
After cleaning things around the house & looking at a lot of various different memories, eventually Tyler will want to take a break by the fire in the living room..
After a bit of conversation, he will go into the kitchen drawers and pull out another goblin book with various drawings of different creatures they did when they were younger.
When 3 are placed down infront of you and the camera turns to a first person view, look up and you will see Tessa, Eddie and Sam (in memory form)
Our job is to determine which animal fits those 3.
So on the left you will want the Pelican (Which represents Tessa)..
In the Middle you want the Moose (represents Eddie).
On the right you want the Bear (represents Sam).
When you've done that, look at Tyler and say definetely when he asks are you sure?
Achievement should then unlock.
Go to 24:40 if you prefer a visual
Hope this helps!