i discussed this with someone at length yesterday who I picture as avi...was it you?
although this achievement looks amazing, I think it's actually not. if you notice, he abuses the uniform loads of monsters, and not very precisely, either. once you learn exactly where on the edge of the screen a koopa is going to pop, you just have to jump into that general area to keep your vault going.
what i think took a lot more skill was that amazing Tetris video that made the rounds half a year ago. that required actual skill and quick thought and judgment, not just learning the loads of monsters.