Impossible Boy vs. Zombie Boy
So far there's discussion on the community about which one of these two achievements is harder. Whatcha think people? Did you feel more stressed with Cotton Alley Dark World? Or maybe zombie meat boys were more painful to you?
As for me, I'm kinda surprised there is a discussion actually. Up to me, Impossible Boy is WAAAAAY harder. I managed to get Zombie Boy and surprisingly it has not taken as many attempts as I expected (although I'll admit it got me tons of frustration. Do you know how it feels to die at the very last jump of 5-3x when it's your las level before the achievement? Oh boy.).
Dark Rapture has some levels such as 5-9x or 5-19x that are pretty unpredictable for some odd reasons (I found that zombie meat boys does not always respond at the same movements so patterns are harder to find), but Dark Cotton Alley is simply ridiculous. I haven't put myself serious on it yet but I'm already absolutely sure this one's several times harder.
It just has so many unpredictible levels, and some others require an EXTREME accuracy on your jumps. Some other levels have a clear path but it just looks like they're really missable if you're under pressure (remember: your biggest enemy in this game is yourself.). Moreover you cannot choose characters on these levels so you just must have balls of steel.
So, what about you? Which achievement brought you (or is bringing you) more trouble in terms of difficulty and frustration?