Board Thread:Support Requests - Getting Technical/@comment-26084508-20170406180543/@comment-9605025-20170406200638

I would guess not. The only custom achievements that can be created are linked to pages in categories. All the other achievements associated with things like blogs, user pages, and consecutive days of editing are controlled solely by Wikia. Admins are not even allowed to disable them without disabling all of the achievements feature.