I never thought that Van Halen deserved their own version of Guitar Hero. They were a good band, but they only had a few good albums back in the 1980's before they broke up the first time. After that, they turned into Van Hagar, then went back and forth a few times before realizing they could make a lot of money touring with good old Diamond Dave again. The idea of their own standalone game seems sort of silly and that's probably why they gave it away for free with Guitar Hero 5. That's also probably why I haven't played it until now.
Here are the handful of achievements I unlocked, on purpose. Unlocking more would have required a lot more time, and once you've played one Guitar Hero game, you've pretty much played them all.