Although it's not been officially announced, we've heard of this game called Guitar Hero Van Halen. We can't be sure it exists, but rumors, retail listings, and German ratings boards seem to indicate that it does. As do the handful of rumored achievements for the Xbox 360 version of the game that Destructoid exclusively got its hands on today. 

If they are legitimate (and we have every reason to believe they are), they reveal quite a bit about a game which we previously only knew the name of. Three Van Halen tracks that will be playable are mentioned by name -- "Little Guitars," "Cathedral," "Spanish Fly," and the instrumental guitar-gymnastics classic "Eruption." Real-world locations like West Hollywood, Dallas, London, The Netherlands, Los Angeles, and Rome are also revealed. 

In terms of features, it appears the game will be full-band experience, as expected. "Expert+" mode on drums will be making a comeback from Guitar Hero Metallica, as well. One Achievement ("Ouch!") hints at what we believe could be a new option in the game's create-a-character, custom tattoos. And finally, Eddie Van Halen's famous "Frankenstein" guitar (picture above) will be unlockable. 

The full list of achievements (minus the secret achievements) can be found after the jump. It's interesting to note the names of them, which could hint at other playable in-game tracks (i.e. "Running With the Devil," "Ain't Talkin' 'Bout Love"). Feel free to speculate away. 

We contacted Activision to verify the validity of the achievements and game details, but were told they "don't comment on rumor and speculation."

Have You Seen His Grades? 5 GP (Complete a tutorial level)
It's Alive 5 GP (Unlock Eddie's Frankenstein guitar)
Ouch! 5 GP (Create a custom tattoo)
Intruder 10 GP (Complete the career intro)
Van Halen 10 GP (Complete a career on Beginner, Band or Solo)
Every Band Wants Some! 10 GP (Complete a song with the full band, 4 player band)
They Ran With The Devil 10 GP (All band members get a 50 note streak at the same time)
Somebody Get Them a Doctor 10 GP (Hit 100% of the notes in a song as a band)
Atomic Power Punk 10 GP (All band members activate star power at the same time)
Hung High 10 GP (All band members earn 8x multiplier at the same time)
EVH 10 GP (Unlock all of the Van Halen instruments)
The Broken Combs 15 GP (Complete a gig in West Hollywood)
Ain't Talkin' 'Bout Dallas 15 GP (Complete a gig in Dallas)
Far Away Lands 15 GP (Complete gigs in London and The Netherlands)
The Space Brothers 15 GP (Complete gigs in Los Angeles and Rome)
Van Halen II 15 GP (Complete a career on Easy)
Jump 15 GP (Complete all Van Halen songs)
Rock Out Big Cities 20 GP (Complete gigs in Berlin and New York City)
Unchained 20 GP (Unlock all Van Halen characters)
Women and Children First 25 (Complete a career on Medium)
Fair Warning 35 (Complete a career on Hard)
The Tour is Ending 35 GP (Complete a majority of the gigs)
Diver Down 45 GP (Complete a career on Expert)
1984 55 GP (complete a career on Expert+)
The Wood Shed 60 GP (5 star guitar for 'Little Guitars,' 'Cathedral,' 'Spanish Fly,' and 'Eruption' on Expert)
316 65 GP (5 Star all Van Halen songs on Bass Career)
Diamond in the Rough (5 Star all Van Halen songs on Vocal Career on Expert)
Double Bass Master 75 (5 Star all Van Halen songs on Drum Career)
Guitar God 100 GP (5 Star all Van Halen songs on Guitar Career) expert
5150 100 GP (Complete all Van Halen songs on every instrument)

[The rest are "secret" achievements]