So from the ones i've experienced personally.
1.While Driving a Vehicle on Vikendi, come to a complete stop inside the redzone. I did this.... my team thought i was nuts and after the match i'm still 0/5
2. Oh, the things you'll break! I destroyed 10+ windows, 10+ doors, 10+ fences, 8 tires, and 2 vehicles I did this 3 times and it has never registered as completed.
3. Get 1 kill using an SR/DMR. Got a kill with the SKS and it didn't count.
I'm sure there are many more not triggering but this is frustrating.