Google Analytics Popular Posts is a WordPress plugin built by the Institute for Nonprofit News. Its goal is to make Google Analytics easily queryable from WordPress dashboard, aiding in post aggregation, article metrics, and better editorial understanding.
The plugin also comes with a Google Analytics Popular Posts Widget for displaying most popular posts. The widget will display a set number of headlines of the most popular posts as either an ordered list (numbered) or an unordered list (just the headlines with no numbers).
Full documentation on the plugin and widget is available on the Google Analytics Popular Posts project on GitHub.