Nice guide so far.
OMG - getting Young Man is very very hard. I got age 19 in the 4 player game (playing single) easily. But no cheevo. So you have to get it in the original mode. I hat 25 with a score of 130k. Then I hat a good game with 210k and I was very confident that I'm a lot younger. As a matter of fact I was 24. Concerning to the leaderboards you need at least 300k.
Also I need more info about:
Ufo in Exzeal. Nothing happens (Trizeal was no problem).
Robo On The Block - do you mean the 1st blue block? I can't see another special block.