Look at Rob dancing.

Dance with four elephants around the chair.

Upload some music to your system, play that music while playing with detuned, and maximize one of the distortive sound effects.

Use the right stick to crank up an effect.

Watch the demo mode to the end.

Played in a co-op game with either an employee of Gearbox or someone who had this trophy

Completed 15 missions in co-op

Fill the screen with the maximum amount of blood on any level.

Killed 15 enemies with the Hunter's action skill

Rescued a groupmate from death in a co-op game

Discovered Eridian Promontory

Complete Zombie Academy.