I have all, but one Achievement on the Xbox 360 version (Flawless Raider). I upgraded to Xbox One this past weekend and noticed, although I can see my 360 Achievements, it's as if I have to unlock the same achievements on the Xbox One, however. How is this going to be possible for those like collecting Ghosts, Grimoire Score (currently at 2560), etc?
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The game syncs up. They may not Pop right away but they will.