Tsantsa is an achievement in Halo: Combat Evolved Anniversary. It is awarded for completing any level with three skulls active on Heroic difficulty or higher. It is represented by a modified version of the Legendary difficulty shield - the combat knives are replaced with shotguns, the skull is a human one, its eye sockets glows red, and "3" is emblazoned on its forehead.
The Achievement is worth 50 Gamerpoints.
The skulls can be chosen by the player, but the combination with the least effects on gameplay is Famine, Bandanna, and Grunt Birthday skulls. Famine skull's effect is removed by Bandanna skull's effect, and Grunt Birthday skull doesn't make gameplay harder.
In Shuar, Tsantsa means "shrunken head," referring to the skulls required in the achievement.