I got them all after a couple of days. Mean Bean Machine was the worst, but wasn't so bad once I started using the save feature every time I got a good shot in. Super Thunder Blade what I did was set it to easy with max lives and fly in counterclockwise circles about as wide as I could do without hitting the buildings. Sudden changes of direction seem to be a no no since the thing changes direction so slowly and they are always shooting where you just were.
EDIT: I'm fairly sure the Vectorman one is either cumulative or counts the ones you get from kills also. I reached it long before I had 500 by my count. But it's another one where judicious use of the save option will help greatly.
EDIT: I'm fairly sure the Vectorman one is either cumulative or counts the ones you get from kills also. I reached it long before I had 500 by my count. But it's another one where judicious use of the save option will help greatly.