Board Thread:Support Requests - Designing Your Wikia/@comment-25197689-20140831113109/@comment-4954276-20140831114227

First you have to be an admin to have access to the page. If you're not, it won't let you see it.

To access the page, simply add Special:AchievementsCustomize afer wikiname.wikia.com/wiki/.

Which should give: wikiname.wikia.com/wiki/Special:AchievementsCustomize as address.

Note that wikiname has to be replaced by the name of the wiki for which you want to access the badges page.