The Last of Us 2 Walkthrough Chapter 2: Seattle Day 1 - The Birthday Gift

This The Last of Us 2 Walkthrough Chapter 2: Seattle Day 1 - The Birthday Gift points out a hidden trophy and highlights all the collectible locations including: 1 Artifact, 2 Trading Cards, and 2 Journal Entries.

Follow Joel and the swimming instructions.

Journal Entry - T-Rex Sign

Interact with the museum sign to get another journal entry.

Hidden Trophy - Looks Good On You Trophy

Pick up the hat from the display when you enter the museum and pick up the hat. When you enter the first exhibit, put a hat on the dinosaur on the right. Take it off and put the hat on another Dinosaur. Then, approach Joel and interact with him to put the hat on his head. This unlocks the Looks Good On You trophy. Note: you may get this option after just one dinosaur.

Trading Card - The Nighthawk

In the second dinosaur exhibit area, move past the brachiosaurus and triceratops towards the dimetrodon in the corner, and look for an alcove leading to some restrooms. The trading card can be found on the bench outside.

Journal Entry - Bench Upstairs

Approach the circular wooden bench upstairs to sketch the rockets.

Trading Card - Saura

Trading card location (cross the water to the bear statue, climb through the window, continue forward to the moose surrounded by wolves) on the right is a trading card. It’s under the bench near the “Wyoming Museum Exhibit Entrance” sign.

After this section, you hear rumblings and crouch to get deeper into the rundown parts of the museum.

Artifact - Suicide Note

Pick up the suicide note by the body. It’s under the “There is no light” message.

Continue forward, soon a cutscene will play and lead you into Seattle Day 2 - Hillcrest.

source https://www.ign.com/articles/the-last-of-us-2-walkthrough-chapter-2-seattle-day-1-the-birthday-gift