Can you have people on the same Xbox do it? My friend wants to do it with me as a guest, but if we don't get the achievement, we'll be more than pissed off.
I was actually wondering the same thing, but my guess is that it would not work with guests. You should google or youtube it.
I thought that as long as it was on Xbox Live, with at least two gamertags coming from different Xbox's, it would work. That could mean: - 2 Profiles, 2 guests - 3 Profiles, 1 guest - 4 profiles, 0 guests I'm not 100% sure but it does only say 'over Xbox Live' on the achievement. I wanted to know that too.
Okay, I just did the mission. We completed it. And we... SUCCEEDED That's right. We did it with one guest (on my Xbox) and all the others over Xbox Live, and we all got the achievement (actually, I already had the achievement. I was just helping them, lol) We did the last jump once, and we got pulled out of the cut-scene because one of us died just before the cut-scene. You don't all have to make the jump, you just have to not die. A good tactic to be safe would be to go over to the Grunt easter egg (that slab doesn't collapse. Just don't get out of the Ghost) My guest was a bit pissed when he found out the achievement was worth 0GS. Oh well, it was(n't) worth it!