Cat Quest III

Kidd Cat is the Blacksmith found at the main town in Pawt Purvanna. To begin his questline, you'll need to bring him the Smithy Hammer which will be one of the secret buried treasures you find. From there, he requests a Dragon Bone to create a weapon for you. You'll get this for defeating the boss in Dragon's Rest on Furggy Island in the SW of the map. These are Level 60 enemies, so you'll want to tackle this area later in the game. Bring the Dragon Bone back to get the weapon and this achievement.