Halo: The Master Chief Collection

This is an ordinary Mongoose, armed with a pair of light anti-infantry machine guns, which updated the fleet of the series with the advent of the multiplayer part of Halo 2: Anniversary. Gangoose appears on the Stonetown and Bloodline maps, but the latter is best suited for obtaining the achievement. Since the map's terrain is hilly in the central part, you'll want to try to do it here.

To quickly get this achievement, call a friend or use a second controller. Then create a custom game and change the player's ability settings in Carnage mode, disabling shields and increasing damage effectiveness to 500%. Once the match starts, one player needs to get to the dirt hill in the center of the map, and the second player needs to jump on Gangus on the ramp. Be prepared to shoot a machine gun at a player standing by a hill while flying. Since he has no shields and one bullet can kill him, you will unlock the achievement without any problems.