Your comment states that you've noticed you're missing 72x72 and 144x144. Here's the complete list of sizes that you should include (for iOS 6/7 and iPhone/iPad support):
29x29, 40x40, 50x50*, 57x57, 58x58, 60x60, 72x72, 76x76, 80x80, 100x100**, 114x114, 120x120, 144x144, 152x152, 512x512, 1024x1024
*50x50 iOS icon should actually be 48x48 on a 50x50 canvas. A 1 pixel outline is stripped from the icon in this case.
**100x100 iOS icon should actually be 96x96 on a 100x100 canvas. A 2 pixel outline is stripped from the icon in this case.