Complete 20 side missions.

Allow a Goliath to level up four times before killing him.

Die for the first time.

Defeat a Hunter.

Complete the mission "Plan B".

Obtain the Helmet Key using Jill.

Complete the mission "The Road To Sanctuary".

Complete the mission "Best Minion Ever".

Complete the mission "Shoot This Guy in the Face".

Remain in Zer0's Decepti0n mode for 10 seconds straight.

Reach level 25.

Gunzerk continuously for 90 seconds.