You must access the site via either the full web experience, or the mobile site. But: the front page is not enough. What is enough? [Who knows][1] (see the Fanatic badge. This is to avoid gaming via scripts).

RSS etc doesn't count because there's no relationship between the RSS feed and your user account.


  [1]: http://meta.stackoverflow.com/questions/67397/list-of-all-badges-with-full-descriptions