Weaponsmith

Weaponsmith is a Fallout 3 achievement on Xbox 360 and PC and a trophy on PlayStation 3.

It is granted for constructing one of each custom weapon. Those are:
 * Bottlecap mine
 * Dart Gun
 * Deathclaw gauntlet
 * Nuka-grenade
 * Railway rifle
 * Rock-It Launcher
 * Shishkebab