I have been playing on the xbox one and occasionally on the 360 and not all my achievements are given to me. For instance, i have an exotic armor piece and weapon and didn't unlock the achievement. The same thing also happened with the ones for completing vanguard marks and crucible marks for the weekly allowance. I wanted to bring this to someones attention and possibly get it fixed.
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I'm having the same issue. But I'm only playing on the Xbox one