Its not a big deal, but going through the achievments I noticed one for "obtaining a peice of exotic gear".
Well, I happen to have equipped the Warlock gauntlets Sunbreakers. They were a reward for completing the Nightfall strike.
DO i not get the achievment because I didnt purchase the gear from the vendor, Xur? It doesnt specify HOW you obtain the gear afterall.
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i have same problem, not with this achievement, but there is always a few days between achievement unlock and action which unlock ... i don't know why