Craft your first Helm

Complete mission "In the Shadow of Starlight".

Complete mission "The Great Vault".

Complete mission "Blood Drive".

Equip purple-rarity gear or better in every slot.

Use a Golden Key.

Reach level 25.

Kill two or more enemies with a single sticky grenade.

Complete mission "Beneath the Meridian".

Down yourself by grenade or explosion.

Reach level 10.

Complete mission "Taking Flight".

Complete mission "Children of the Vault".