The only thing I would suggest you try, is to do one of things mentioned in the trophy. For instance, if you have already crafted 1,000 items as a GSM try just crafting one more. If it works, then after the craft it should pop both trophies associated with the GSM. Rinse and repeat for your other classes.

Disclaimer!!! I have only played on console, so I have no idea whatsoever if this will actually work. But all of your credit towards the trophies are saved in the server, so I don't see why it wouldn't. I switched from PS3 to PS4, and then finished up by BSM (i think..) 1,000 crafts on PS4 and got the trophy, and the large majority of those crafts happened when I played on PS3.

PS3 and PS4 also share the same trophy list, whereas most times different console versions of the game have separate lists. i.e. You can get a platinum trophy for PS all-stars (the PSN-type Super Smash Bros. game) on PS3 and on Vita.

Hope it works for you!


Edit: Just read that's exactly what you were doing.

As far as I know this is the only way you can activate them, one by one.