Deciphering monoliths requires the player to find collectibles to level up their language, and then have to find a cache based upon riddles from the monolith, so this one needs collectible like "Reading the Past from" RotTR and probably also level? (as you level up your language skills before you can decipher them (I think level was added to "Reading the Past" because of that)
in Rise of the Tomb Raider all the ones related to challenge tombs got collectible (since you have to find the tomb, and then find the grave at the end), I think this one should also get collectible then. Or remove them from RotTR.
See Stele Hunter
Not sure if this one needs collectible. You first need to find the 'blueprints' by finding them in crypts (hence the flag) but you can also buy them in stores, thus skipping the collectible part. If i remember correctly things like this didn't get the shop flag as you can skip buying it by finding them in crypts, but it goes the other way around too. So maybe also no collectible then?
This also needs level up, as afaik all weapons have a 3rd of 4th upgrade slot, and you first have to enable those by buying the correct skill. Correct me if i'm wrong though, I'm currently not at a camp and don't have all the weapons in the game. So there might be one without tier 3 of tier 4 upgrades (although I doubt that). Will check when i'm at a camp and comment in the thread if what I said was wrong.
Needs collectibe like the chievo in the previous Tomb Raider game:
. Challenges are simply: find and destroy five of these statues, and you'll have to run around that subregion to find the five statues, so they work exactly like collectibles
These will need collectible like the Challenge Tombs
See to the Nines
I think this one needs missable. There are around 10 side quests and "Hearts and Minds", "Unwelcome Guests" and "I Believe Hakan Fly" are marked missable, thus missing those three you can never do 8 missions. With probably more side missions missable this achievement is missable too.
The Focus skill needs to be bought by levelling up and getting skill points, so this one needs to have the level flag (note: don't change the Perception achievement, that skill you get whilst progressing main quests, no skill points whatsoever required)
The Endurance skill needs to be bought by levelling up and getting skill points, so this one needs to have the level flag (note: don't change the Perception achievement, that skill you get whilst progressing main quests, no skill points whatsoever required)
One might argue this is a collectible achievement too. As you need to pet 5 unique lamas (cannot pet the same twice) thus having to find their locations in Paititi (not sure if there are more than 5 and if that matters). They're spawn locations are fixed though, and they don't move (like collectibles).
This one needs level as you need the "Serpent's Glint" skill before being able to craft flare rounds (which requires you to gain skill points and buy the skill with)