Vehicular Manslaughter
Common49.1%ObjectiveOptionalAnywhere
Defeat an enemy by running it over with a minecart.
Build a short minecart track through a mob-heavy spot (or your farm's spawn area), get up to speed and plough into something soft - slimes and zombies die to a good ram. Minecart tracks craft from iron/lead and wood; any kill while riding pops it.