Super Meat Boy - Rapture, Dark World (No Death) [Zombie Boy Achievement]

The 20 levels from Rapture, Dark World without dying. This achievement was one of the most difficult things I have done in my life haha, so I did it in a crazy order: 20, 5, 8~9, 15~19, 1~4, 6~7, 10~14. Took me 118 tries, without counting the insane training for each level: I only followed to the next if I managed to beat it 5 times in a row. At total, I spent around 15h trying.