I'm against it. In my experience on the Doctor Who wiki (which has had the achievements for over ten years), it caused more trouble than giving any help. In fact, to this day there are still people who make frivolous or downright incorrect edits in trying to win badge points. A few years ago, there was one editor who made nearly a hundred edits, adding and removing the numeral "1" from pages over and over until an admin stopped him.
I don't edit here so maybe my input isn't worth anything, but it seems to me that this wiki is not short on editors who are daily improving the wiki. The achievements/badges are really designed to help increase editing, and I don't think this wiki needs it.