Vault 13's Revenge

Vault 13's Revenge is a challenge added in the Fallout: New Vegas add-on Gun Runners' Arsenal.

Obtaining
To complete it, you must kill Super Mutants with 5.56mm Pistols, Plasma Defenders, Plasma Grenades, Power Fists, Rippers, or the Bozar.

Behind the scenes

 * This challenge is a reference to Fallout, as all of these weapons could be acquired by the Vault Dweller, whose home was Vault 13 and who faced the threat of the super mutant army.