Haha, for the One Shot, One Kill on veteran I just laid prone in the far right ticket stand (looking at the ferris wheel). I placed claymores all around the ticket booth, and threw the C4 where the enemies come out. When McMillian says they're coming, wait about 10 seconds, then detnoate the C4. Then just stay in the ticket booth as far back looking at the door. No grenades can kill you through the ticket booth, and if one comes in just throw it out through the door. If someone actually comes in sight kill them.
Just lay there, and don't kill anyone unless needed. McMillan is invincible (I think) for that part...either that or he didn't die in my game. Just wait for the helicopter to get there, throw a flashbang at the enemies when it gets there, sprint, pick up McMillan, and sprint towards the helicopter.
And yes, I was on Veteran and that worked.
Viking Fan, take this advice. It helped me get the acheivement.
I don't think the Mile High Club is really that hard of an achievement, if you have already gotten it on another account. I got it on my brother-in-laws account for him for $10. And when I got it on my account I just used a pistol mainly (except for on the 2nd floor when all those guys run at you in that little hallway before the hostage situation).
True. After I did it on my friends account it was a breeze on mine.
But how did you get through it with the pistol? Especially in the first part?