I got it a while ago, when I finally unlocked the Kid, I got three achievements, "Complete all retro warp zones" "Unlock the Kid" and "Golden God". I haven't actually completed everything yet though, one level (7-2X) to go. Man, that level, what the hell. It is so much above all the other levels in difficulty. I can beat all the other levels with not much trouble at my current skill level, but 7-2X is just beyond me.
Really? I didn't have trouble with that one only 7-15x and 7-20x I didn't even try to do them.