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Vigilante

From Halopedia, the Halo wiki

Vigilante is an achievement in Halo 2 (Windows Vista). It is worth 10 Gamerpoints and is earned when the player stops an enemy's Killing Spree, similar to the Killjoy medal from Halo 3.

It is represented by a octagon with a green four-pointed star and a bulls-eye on the interior.