General Custer is a cut achievement/trophy in Fallout: New Vegas.
Leading all your companions to their deaths. As companions only become "unconscious" in regular play mode, this achievement would only be obtainable on Hardcore mode.
Behind the scenes
This is a reference to an American general, George Armstrong Custer, whom led the men under his control to their deaths in the futile Battle of Little Big Horn against a combined force of Lakota-Northern Cheyenne and Arapaho Native Americans, on June 25, 1876, which came to be known as "Custer's Last Stand".