Domination and Kill Confirmed are good ones. Domination speaks for itself as you can just hold down any area since the spawns are more predictable. I would advise adjusting your class to make whatever weapon you're using the only lethal thing you carry. I missed out on a couple of medals towards the achievement because of C4.
Soul Silver FC - 4469 3620 2054 / Diamond FC - 1033 3883 0634
Personally, I like GW, especially domination, for bloodthirsties. I'll also run KC on hardcore depending on the weapon. I'll generally put three attachments on the gun and run with no secondary or lethals so I'm forced to use the primary. Shock grenades, dexterity, and anti-uav perks all help.
Why don't I strap on my job helmet and squeeze down into a job cannon and fire off into Jobland where jobs grow on little jobbies? PSN: emceecrispy