Skullamanjaro

Skullamanjaro is a multiplayer medal available in Halo: Reach. It is earned by winning a Headhunter match by scoring ten skulls at once. It is represented by a skull surrounded by ten yellow stars on a white circle. Note this medal cannot be obtained by betraying teammates for their skulls.

Trivia
Earning a Skullamanjaro in a matchmade game on an Anniversary map unlocks the Bounty Hunter achievement.