Master of the Arsenal

Up to the Challenge is an achievement/trophy for the Fallout: New Vegas add-on Gun Runners' Arsenal.

It requires the player to cause 10,000 damage with Gun Runners' Arsenal (GRA) Weapons.

Tips
Gather all companions in the Lucky 38 presidential suite. Bring a GRA Fat Man and any ammo subtype (Recommend Big Kid or Tiny Tots) and unleash nuclear Hell upon your faithful companions. ALWAYS make sure to save prior to doing this, obviously. The same trick works for the Achivement dealing with Explosive damage(Please fill).