Purchase any house.

Defeat Psychoreaver.

Stealth kill all enemies in the mission "Madd Dogg's Rhymes".

Go 24 hours (in game) without breaking the law, being wanted, killing or harming anyone.

Reach maximum weight.

Use a Pay 'n' Spray with wanted level.

Defeat Dr. Benedict.

Use a Golden Key.

Break into a building through the chimney

Kill two or more enemies with a single sticky grenade.

Complete mission “Enter the Psychoscape”.

Win a duel.

Tip Moxxi.