I have the same issue (and I suspect everyone has).
My guess: Something will happen when we find all 50 fragments and there will be a final step of the quest line (even though the achievement popped already). Would be weird to have it end at 45 when there is 50 total.
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has nothing to do with finding ALL 50 fragments.....look at the pre req for quest i have completed all of it....therefor earned the shader..says nothing about finding 50 fragments anywhere hell i even have trophy,emblem,and ToM its a bug. also note bungie even said they will look into it...which its been way too long and should've been fixed already