Disney Infinity Fans

Is there anywhere where I can find out how to unlock all of the toys in playsets? For example I want to unlock Sand People, but have no idea how to do that (I finished both SW playsets so I know it is probably a challenge). Thanks.

Most unlocks come from feats or 3 staring all the missions. The only items from challenges are in RotE you get jabba, R2D2 and AT-AT turret. In TotR you get a few different enemies.