Beat the game and start a new one, you can use dual wield in a new profile without unlocking it for that profile specifically.
Simply activate the Dual wield feature in the completed profile then backout and go to the new one. Dual wield should be automatically chosen for you.
Unlockables
Unlockable
How to Unlock
Director's Cut Mode
Complete Story mode to unlock Director's Cut mode.
Handcannon Weapon
Complete Story mode to unlock the handcannon.
Gangsta Bonus
If you kill 50 or more mutants on one level holding your remote/gun sideways you get a bonus of $1337 at the end of the level.
Aw screw it, let’s just Jump!
Welcome to Guitar Hero: Van Halen, you’re now going to be rocking out to another legend of rock n roll. Not only are you going to be playing the 25 epic Van Halen’s tracks, you’re going to be playing couple of Eddie’s signature solos such as “Eruption" and "Cathedral.” Other than the list of Van Halen’s songs being able to play, you’re option to play 19 other artists such as Queen,... read more...