Hidden knowledge (bug?)

[Morgan]

So I read 5 black books and got their perks, 1 was the one which is early on in the dragonborn quest in miraak's temple, and 4 were in caves etc. that's 5 black books, but I did not get the achievement?

Is this a bug or should I read the 5 I have again (just to go through them all again?)
Or do I need to get all 7 ?

- Thanks

[Da Atte]

Really sorry for reviving this old ass thread but I'm having this problem right now and cannot seem to find any information ragarding it. Seems like the bug isn't that common?

EDIT: I myself have all the 7 books and have completed them.
EDIT2: I seem to have completed all of the Black Books but for some reason I've completed only 5 of them (judging by my quest log). Still, 5 should be enough to get the Achievement.
EDIT3: Reloaded a couple saves back... Completed the last book and now I got the Achievement.

[wowszer]

Sometimes it is just time for your achiement to be recognized, some times glitches happen, you have to redo.And do I hear someone saying Bethesda is faultless?