Reach level 25.

Kill two or more enemies with a single sticky grenade.

Complete mission "Atlas, At Last".

Down yourself by grenade or explosion.

Complete mission "Hostile Takeover".

Use a Golden Key.

Kill an enemy with an exploding barrel.

Complete mission "Children of the Vault".

Revive another player.

Get at least rank A on any level on normal difficulty without any modifiers.

Reached level 5

Completed the mission "My First Gun"

Clear any level with faster song speed modifier.