Complete the Duviri Paradox quest
Access the Duviri Circuit and the Duviri Experience
Farm Kullervo parts from Kullervo’s Hold in Duviri
Defeat Kullervo to earn Kullervo blueprints and components
Buy Kullervo blueprints and components from Acrithis in Duviri using Pathos Clamps
Craft Kullervo’s component parts in the Foundry
Craft the Kullervo Warframe in the Foundry after obtaining all parts
Use Platinum to buy Kullervo from the Market if you want the instant unlock option