(From PowerPyx on YouTube)
The Last of Us Remake has a total of 254 Collectibles.
54 Optional Conversations
97 Artifacts
30 Firefly Pendants
12 Training Manuals
13 Comics
6 Ellie's Jokes
13 Shiv Doors
11 Workbenches
4 Safes
5 Workbench Tools
9 Chapter-Specific Trophies
Finding all collectible locations unlocks the following 9 trophies:
Look for the Light [Gold]
Endure and Survive [Gold]
Chronicles [Gold]
Getting to Know You [Gold]
Something to Fight For [Silver]
Master of Unlocking [Silver]
Prepared For the Worst [Silver]
Sticky Fingers [Silver]
Sharpest Tool in the Shed [Silver]
I would highly recommend watching the video guide and following along. You should be able to get everything done the first time. For reach of the Optional Conversations, wait until the conversation is completely finished before running off.