The achievement numbers are pretty borked... I've gotten up to max level, had some very long runs (my last playthrough was literally an hour, until the game started going so fast that I phased through everything on screen and had to attempt to combo off invisible enemies to stay up), and I still have bronze on over half the achievements. And by a pretty ridiculous margin, too. I haven't even seen 100 med kits, and 100 sea monsters is astronomically high when there are 3 items that you have to dodge to be able to fight one. A fun waste of time, but there is no way I'm getting those golds.
Fun game, but the accelerators are pure evil. Between their habit of pointing at obstacles and random gusts when I try to go through, they proved more dangerous than the obstacles. And, just when I'd finally convinced myself they weren't out to get me, one flew in from the top of the screen dragging a biplane and plowed right into me. Hell of a glitch.
 "Flood Runner 4"){kind=icon}
 "IntoSpace!"){kind=icon}
 "Mytheria"){kind=icon}
 "Snake"){kind=icon}