This is a brilliant walkthrough, thank you
I'd just like to say that I found a consistent way to do the nightmarish jump at the end of Level 47 though; rather than trying to jump onto the far right edge of the conveyor belt and jumping straight off as you do in the video, instead you should just land on it and hold right so you start doing small bounces along it, then jump off when you get near the right edge. You comfortably get enough height doing it this way and don't run into the problem of your momentum stopping dead.
Also thought it's worth mentioning that the Master Collector achievement for collecting 60 stars can glitch in exactly the same way as the Star Hunter achievement. This happened to me and I fixed it like you did with Star Hunter by replaying the first level. Not sure whether it would have popped if I'd have just got 3 stars on the next level, but I didn't want to risk potentially glitching it even more.