You have find missing girls in level 8, 15 and 13. After rescuing them go to Extras.
i did that a while ago, is there another set of girls?
I don't think so. I you are sure you've found all of them and you still can't unlock Annie's Expodition, you could try running the 0.6.3 version to reset all of your data. Everything introduce in version 0.7 would need to be completed again though.
