To complete the Mithril is the New Gold achievement, You must obtain 15 Mithril Ore and through Mining, 15 Mithril Bar through Smithing and make 1 Mithril Full Helm through Smithing.
To complete the Mithril is the New Gold achievement, You must obtain 15 Mithril Ore and through Mining, 15 Mithril Bar through Smithing and make 1 Mithril Full Helm through Smithing.