Hi,
I'm on the "survive 9 deathclaw attacks with no casualties" objective, but have found that several times I've successfully fended off an attach without it counting. I'm quite confident that there were no causalities. It seems to count sometimes (I'm on 6 of 9, but I've completed more like 10) but just had it not count one again.
Frustrating because it takes forever for them to show, isn't always easy to do with no causalities, and then it still doesn't count!
I haven't noticed any pattern as to when it does or when it doesn't. It gives me the little update screen whenever it does.
Next time I'll probably just skip, but now that I'm at 6 of 9 I want to finish for the lunchbox.
I've not seen this happen on any other objectives that I can remember.
(I'm on 1.2.1 on IOS)