<p>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? <a href="http://meta.stackexchange.com/questions/67397/list-of-all-badges-with-full-descriptions">Who knows</a> (see the Fanatic badge. This is to avoid gaming via scripts).</p>

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