There are five Trust Levels (TL0 - TL4), but the highest is attainable by invitation only and is confined to forum staff.
In addition to the link @Mittineague provided, you might find this helpful:
(It’s also linked from the FAQs if you ever want to refer to it again.)
You can see the list of all current badges on the badge page: http://www.sitepoint.com/community/badges. (There are links to the badge page and the FAQs in the “hamburger” menu.) Clicking on a badge title on that page will show you the members who have already earned that badge.