Oh god, there's a glitched boss in the dark world too?
I'm not going to bother finishing the last level of dark world ch. 6 then, at least not until I'm done with other stuff.
PS: The iron man achievements - does anyone actually have all of these? lmao. How on earth could anyone do cotton alley? It was hard enough doing world 1 dark without dying.
I'm going to assume this is in fact, completely impossible. However, maybe it could be using a character I don't have unlocked yet?
Edit: There's a video of someone doing it on youtube.
It doesn't show the achievement being unlocked though, so it's probably edited.
edit 2: What's with the thing that occasionally pops up, with a picture of super meat boy looking like a pirate, saying something like, see you at 100 meat? XD