I just got the full collection of stickers(2004 of them) but I can not get the achievement to come up. I have went to my sticker album, ordered my sticker album, the games page, and went to the achievement itself but it is still not popping up. I have also cleared my cache.

EDIT: So I think I just figured out what might be the problem. This sticker that was supposed to have gone out with MM. Ugh!! Just my luck!