I really enjoy working towards badges.
How can I track my progress towards badges? For example, the Gold copy editor? Or perhaps (dare I ask), the Legendary badge (I think I'm 1/150th of the way towards this one)?
Specific to the badges you mention, here are some ways of establishing them:
Under any of the statistics pages associated with reviews (for example, the Review Close Votes page), hover over the review progress bar to open up a fly-out that contains the relevant information:
Visit the reputation calculator and scroll to the bottom. It displays the following information:
days represented XXX rep cap was reached via rep from upvotes *only* on XXX days earned at least 200 reputation on XXX days earned XXX reputation from suggested edits
However, a reasonable way (barring a time lag of a couple of months, sadly enough) of establishing your road to badge-stardom is via the TeX StackExchange Data Explorer. For example:
In particular, scroll through and check out the list of favoured queries.
There's a Stack App called StinkingBadges, with which you can track you progress for Legendary and Generalist, and also which posts of yours are approaching a nice/good/great badge.