Ah, I finally went and completed all 50 achievements. I suck on guitar, so two of my last three were the 100% solo and 100% song, to go with spending 100k in the Rock Shop. Got the song on Roxanne (which I had long ago done my bass upstrum on, too). I found it really hard to adjust to the little buttons for the solo, especially having very large hands. Thank God for El Scorcho. I had to play that awful song through like 5 times just to get used to the solo buttons, then like 3 times to figure out I had to not strum, even on the first note of the solo, to get it. I should have read up on that, lol.
Spending my band $ was easy. I had a couple hundred thousand on one of my guys....just had to go buy everything that was expensive.