It has nothing to do with getting kills, the challenges are annoying as hell. It's going to kill my k/d r. Headshots = Luck unless you sneak up on them. Penetration kills = Occasional Give 3rd person a try for FMJ kills, on a good map I can get 20 FMJ kills.
Not bad for a start, if you come against anyone who's been playing the game for any longer period of time, you're very likely to get obliterated though.
From the looks of things, Garus and Tali are the only ME1 squad mates to be in ME2 as squad mates. Video on gamespot up of a look at the new Normandy and some game play, looks amazing.
I know that, I asked if the prestige challenges reset when you prestiged. I missed another few collaterals again today, I think I should just accept the fact I'm not the best sniper in the world and move on. :P The majority of the prestige challenges don't get reset, a few on the prestige list get reset.