Thorin is unlocked and playable after completing Chapter 1, "Greatest Kingdom in Middle-earth." You will have to use this Thorin; don't use any other version Thorin, like Thorin “Lake-town,” as it will not count.
You need to find the blacksmith design for the Mithril Mushroom Crown. You also need small character like a dwarf or hobbit to crawl through the little wall doors. To find the design, open your map and look for the icon North of Bree. Press to set a marker on it.
Design: Travel to Bree. This is found at the northern end of town. There's a wooden door that will open for you, leading into a small cave. In here, you want to crawl through various dwarf shafts to grab the key and open the chest containing the design. Smash the stuff left of your screen it reveals another door.
Once you have the schematic, travel back to Bree to use the Blacksmith. Make sure you have some Mithril to forge it otherwise you need to do a quest or story mission to get one. You'll have to hit one of the following buttons in the order that appears on your screen, it will be random. in any order to forge it right. Once that is complete, it will be added to your Treasure Trove. Equip it and the achievement should unlock.
Use the normal Thorin but you need to make sure that the Mushroom Crown is forged perfectly i.e. when you hover over the item it will show a coloured version and a pure Mithril version. You need to equipment the pure Mithril crown to him.
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