King of the Buzzard World is a challenge found in Tundra Express. To complete it, players must find their way to the rooftop of Buzzard Academy. To do this, go to the northern-most helicopter pad. From there, a stack of boxes will lead to the top of a curved building to the south. From here its a simple series of jumps to reach the rooftop. Once on the rooftop, a number of Buzzards will spawn, though players do not need to kill these to complete the challenge.
This challenge is worth 5 Badass Rank.