every time u get a checkpoint to save and quit and if you die to go to the dashboard and go back to the game. You will start at your checkpoint with your death count reset to zero making the achievement "that just happened", much easier. Stop watching the speed runs and other videos and just follow this simple trick!
I'm not trolling I'm dead serious I've tried it myself earlier
[Edited on 11.24.2011 10:15 PM PST]
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holy crap, excellent find. im going to try it the regular way a few times and if i cant handle it ill go with this.