Kill five enemies in a row with headshots

Kill 10 enemies with headshots

Find one treasure

Complete A Mission In Co-Op Mode (Any Difficulty Level)

Fully Upgrade A Single Stat Of Any Weapon In Campaign Mode

You have defeated all bosses and are a powerful force to be reckoned with

Killed an enemy with the Siren's action skill

Killed each of the loot midgets

Earned level 50

Complete any one stunt from the stunt list.

Gain a level with one character.

Clear the Emerald Hill Zone 1.

Destroyed a Lancer while in a Racer