I then started a new band (alone, alternating between Guitar in Hard and Vocals in Medium), and played all the way to the setlist in which you earn the bus, and now actually got that achievement. I continued on that same band until the plane setlist, which I completed, but I didn't get the achievement "Jet Setter". This was all on the same session, just in case it has something to do with the problem.
I desisted with that for a while, and several days later (that's today) I turned on the game for some challenges. Before today, I hadn't done any challenges except for one: the Band Warmup challenge, completed on Hard with two people. I set myself to get the "Challenge Novice" achievement (5 challenges in Expert). I played through five challenges, by myself, in Expert, and.... I didn't get the achievement. As you may note, the Band Warmup challenge is NOT one of the five, as I had completed it in hard and didn't have another person to play with then, so I completed OTHER five challenges in expert.
Any suggestions? Is my game glitched up, or am I doing something wrong? I'm really confused as to why this is happening.
Oh, and for what it's worth, I haven't had any achievement problems like this in any other games, although I haven't played any recently, other than Rock Band 2 (recently being the past two weeks).









