A week or so ago, we confirmed that Phantasy Star II and Sonic 3 would be coming to XBLA via their achievement lists - Sonic 3 & Phantasy Star II
Not to mention Altered Beast, Comix Zone, Shinobi - Confirmed
a few days before.
Now to seal the deal with the classics, Gunstar Heroes
is given it's own set of achievements and looks to be coming to live along with the other five titles in the near future.Achievement list