This should probably be updated, it's not possible to get a single achievement in this game now.
It doesn't matter if you already have it downloaded either, when they pulled the game from the marketplace they also pulled the servers for it and it's impossible to play this game without connecting to their servers as you won't be able to establish a geological location to play it at.
100% Retail; 192 games.
100% XBLA; 194 games.
most proud completes;
Guitar Hero 2, Guitar Hero 3, Guitar Hero: World Tour, Guitar Hero 5, Guitar Hero: Warriors Of Rock, Guitar Hero: Aerosmith, Guitar Hero: Metallica, Guitar Hero (WP), Band Hero, Rock Band, Rock Band 2, LEGO: Rock Band, Lips.
"Stand by your glasses steady and drink to your comrades eyes. Here's a toast to the dead already and hurrah for the next to die"