Re: Gun Master achievement not unlocking (ACW-R)

Facing the exact same issue. I did some digging and i'm pretty sure the trophy didn't pop because apparently vault weapon do not count for the trophy, even though the trophy description explicitly  states "earn a t1 mastery badge with any weapon".

Iv'e seen a thread from a few months ago with people also with this same issue. Disappointing that this bug it yet to be patched.  

Thread in question: https://www.reddit.com/r/battlefield2042/comments/1228p07/gun_master_trophy_not_popping/

I am on ps4 and have had no issues with any other trophies