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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[quote][b]Posted by:[/b] Oh Forgot Pants Huh? Did you do it online or local? Local is an absolute no, but I've heard mixed stories about doing it online. Seems like if you do it over XBL your partner IS allowed to die.[/quote] Nope. I did it via Xbox LIVE.