Just a quick note on the 750k achievement:
After searching the net for 'tricks' to try to complete this achievement, the most consistent way I found to score 750k is on the 'Beyond Reason' level with Hu (Not Warren, as most people suggest).
Try to clear all of the orange pegs that are not in the helix without hitting the helix too many times. Also, leave some blue pegs near the lower part of the helix for an upcoming 'bank shot'.
Use a bank shot off of the wall to put a gap in the helix (at least 2 pegs wide). Then hit a green peg, and with your next ball (your 'zen ball') try to bank off a blue and let Master Hu guide the ball into your gap in the helix.
You won't end up with 13 million points (like some of those youtube vids), but you can somewhat consistenly finish with 750k - 1m points. It took me about 10 tries to get the achievement - but then showing my wife how I did it later I got 900k on the first try.
This achievement IS frustrating, but wait until you get it - the feeling is euphoric!
Hope this helps you!