Old-Tyme Brawler

Old-Tyme Brawler is an achievement and challenge in Fallout: New Vegas which is awarded for successfully dealing 10,000 points of damage with unarmed.

Strategies
One of the easiest ways to get this achievement is to obtain the ballistic fist, as it does an incredible amount of damage. After obtaining it, go to The Strip and kill everybody in Ultra-Luxe, because they are quite weak opponents. Be sure to save before this.