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 -blam!-, it worked!!! Awesome find man! I died twice thanks to some dang rocket Flood and my own grenade that flew towards me after another explosion. Yet, I still got the achievement! The instant you see yourself die, immediately hit the guide button and go to the dashboard.