Dude the greatest Human Achievement ever would be to get the achievement in this game for beating all the missions with an A rating. Not only is this game as boring as all hell, but the challenges get really hard and stupid.
The flourishes are what really made this game shine. I love the one where he pulls out the fries and does like a little behind the back move. I always say something like "yo fries!" in a really 70's black guy voice when that happens
Hell yeah, this is the greatest game ever. However, in terms of the greatest human achievement ever, it's a close call between this and squirrelking's fanfiction.