I'm playing in Xbox One primarily, but also on 360 and there seems to be some sort of achievement lag on the Xbox One. I'll look at my achievements on XB1 and think I didn't receive any new ones. Then I launch the game on 360 and after choosing my Guardian the achievements start popping up like normal, but then there's more achievements - like Lucky 7's - that weren't on the XB1. I exit and launch XB1 Destiny and now I see the missing achievements. Right now I have Decryptologist unlocked on 360 but not on the XB1 and I'm pretty sure I was playing on XB1 when it would have unlocked.