Got a new patch today for the Playstation (patch 1.10) and loaded up the game to do a mission for Brin (to get the Sentinel Loyalty trophy) and this time around during the Sentinel mission, it POPPED finally. I did the following:
Im not sure if others will have the same success or if I was just lucky but the patch notes talk about fixing the following loyalty glitch:
I hope this helps those on XBONE and PS alike and glad to have this trophy done for myself.
Yes, BioWare solved the problem with weapon and loyalty achievements / trophies.
Just equip a specified weapon (the one you have not received achievement for) and kill someone in freeplay.
The same with loyalty achievements. Just do whatever to increase the loyalty level in specified faction. Personally, I just picked up some organic resources and Sentinel lvl 3 finally popped ;-)
Can also confirm, got 1 kill w an Autocannon and did a mission for Freelancer and got both Trophies.. and my Plat! 🤠