There's been some yelling at my tv tonight. That Warthog run in CEA on Legendary is really kicking my ass.
I have two bars of health left. At the first corner (straight after entering the Warthog), I've died at least 10 times because of exploding fuel-rods. Other times I'm getting shot out of my Warthog by Sentinels half way through. One time I've rolled it on the last jump and finished with 55 seconds. Three times now I've been killed by the Flood on the final run with around 1 minute 20 seconds left (which could have easily given me the achievement had I not been killed).
Add in random rolls, entering the wrong seat and you have a very frustrated player.
Think I'll give it another crack tomorrow