This popped scavenger for me:
https://www.nextgenupdate.com/forums/ps4-trophies-game-saves/1025986-the-last-us-remastered-collectibles-cusa00556-a.html
Btw, i did read,flip,zoom-in(nd re-flipped/re-read),
still the comics, pendants & manuals didn't pop.
basically the thing that would always work is a (save & profile) with 1 remaining of each items,
while most floating around are having either platinum profiles with all done or rather none done at all(due to re-region)
only the one that is linked above(in this comment), has 3 artifacts remaining, so the artifacts trophy did pop on getting them, but also along with the scavenger. So kinda messed up the timestamps, but atleast thrs something and also leads to a hint, that we need a "save+profile" with 1collectable missing on each category for everything to work.