User blog comment:Ducksoup/Why Wikia Evolves/@comment-4151266-20150619212559/@comment-3361105-20150620145026

I have seen achievements be a great motivator to work on a wiki - until you start getting the same ones over and over, once you've hit the top tier.

I would like to see them evolve to be triggered by more specific conditions though. Like, adding a specific category to a page, as opposed to editing on a page in a specific category. If I want to encourage people to add body text to a page instead of skeleton data, I need a way to "reward" them by giving them an achievement for adding a "body text added" category to a page. Unfortunately, the way it works now, it can only reward you for adding ANY categories to a page or for making an edit within a category.

That's just one improvement. I do think that, at least on the wiki I am most familiar with, achievements have played a significant role in getting new users to stick around.