Sorry dude, I thought I replied to this. I think I meant to and just... well I blame it on a dog. :-p
The Buy all Upgrades one is a known glitch. There is a work around if you do the USB trick though. The rock one I don't think I have heard that one before. I know there was one I kept missing because it wasn't the most obvious one. Have you followed any type of guide for it?
The only use one Skylander one... ugh. You and me are in the same boat there. That's a bitch. I think I used damn near every one of my guys too. lol
Skylanders is glitched as heck for me. The bought all upgrades won't unlock, nor will the one for smashing all the rocks on that one level. Also, kids must have way more skill than I, because I can't imagine beating Kaos with only one life. I think I used about 18 dudes.