We keep badge unlock rules intentionally vague so that it's more fun when you unlock one!

To unlock partner badges, you must first follow the brand page on foursquare (you can find pages by searching http://foursquare.com/pages). Once you follow different pages, you will be able to see their expert tips on relevant venues and maybe even special instructions on how to unlock their partner badge(s)! You can also refer to http://blog.foursquare.com for special badge updates and unlock details.

Heads up: only badges earned in your current city will show on your app. To see all badges you've earned, visit your Trophy Case.