Currently, meta users can see a list of special tags in several ways:
Via How does Meta Stack Exchange work - Required Tags
Via Tag description/list for "special" tags used on Meta (not up to date)
Via https://meta.stackexchange.com/tags (by manually paging through the list).
I propose this be made a bit easier, using one of two solutions:
The Elegant Solution:
Provide filters on https://meta.stackexchange.com/tags for both moderator tags and required tags. These could be hidden in the legend section at the bottom of that page or added as additional filters in the Popular/Name/New filter bar in the top right of the page.
The elegant solution is self-maintaining, but the benefits of that approach may be too minor to justify the cost.