hey man, i did it in team deathmatch with my normal run-and-gun style. here's my loadout:

-ACR with red dot + silencer

-mp9 secondary (really doesn't matter, i use whatever best machine pistol i have unlocked)

-flash or concussion grenades + semtex

-sleight of hand pro

-hardline pro

-stalker pro

-specialist: quickdraw pro, assassin pro, blind eye

-death streak doesnt matter, but i usually have either revenge or hollow points

you have to be really heads-up in knowing where the other team is based on where your own team is, blips from explosions/gunfire, etc. don't engage the enemy unless you have at least a slight advantage (like you know where they are, or they aren't facing you). the other thing is you really can only die once or twice in the beginning since in tdm the game stops at 75. i got robbed a few times before where i got a few kills away and then the game ended. once i even got the 24th as the final kill! just gotta stick with it. smaller maps work the best, i got the MOAB this way on hardhat, but came close on dome.

there's some other things that you'll learn with practice, like picking up an enemy gun when you get close to your last clip of ammo, and deciding when to engage and when to run away and heal.

good on you for trying it this way and not the normal camping way.