The hardest title to get without boosting is probably 1000 head shots with the intervention.
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Reach Prestige 1 and Level 69.
The hardest title to get is droppin' crates. To get it you have to drop a care package on an enemy in the game winning killcam *if you're a noob you could boost for it in 3rd person
Get to ninth prestige
You have to call in two EMP's.
I believe you get it for calling in 50 uavs.