The Sims 3
As for the Guitar Star accomplishment, that one's been bugging me forever as well. From what I gathered, you need to go to 10 places (or probably throw 10 parties) and perform one of your songs. Not play for tips or just play, you'll actually need to micromanage and click perform, then select a song etc.
I still haven't gotten it though. I got most of the other accomplishments.
This problem has been bugging for a long time and I know there are a lot of people experincing the same thing. Hopefully it would help you guys to become the next Guitar Star.
I will try myself later today.
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