Bookworm glitched?

[Miasma]

So I only had two achievements left to get, Bookworm and Grease Monkey. I was hoping Grease Monkey wouldn't glitch, and it didn't I got it last night, but then Bookworm didn't unlock when I got (what I thought) was the last journal I needed.

From what I've gathered there's 56 journals, and I was missing 3, which I later got and (as I said before) Bookworm didn't unlock.

Has this happened to anyone else? Or am I wrong and there is more the 56?