I am going to show videos of Super Meat Boy. The main part of the walkthrough is getting the achievements that players receive when they complete the main 20 stages without dying. I will complete as many chapters (light and dark) as possible. These will be Iron Man achievements (Meat Boy only, except for Bandage Girl in Cotton Alley). I will follow a few of my own rules:
1. I can only use Meat Boy. If I ever get the Girl Boy or Impossible Boy achievements, they will be done with Bandage Girl.
2. I must complete the stages in sequential order. (Stages 1-20 in that order only)
3. No exiting the stage and starting that stage over if I am about to die. (The game will still give you the achievement if you do this.)
The warp zones, glitch stages, and boss stages are recorded separately from the main 20 stages. It would take far too long to complete all of that without dying once, especially by chapter 5.
This achievement is not too bad. It requires some precision in some stages, but nothing too overwhelming. I got the Salt Boy achievement in fewer tries than I got the Needle Boy achievement. It took me around 15 attempts to get Salt Boy.
Overall difficulty in getting the Salt Boy achievement with Meat Boy only: 2.5/10.