Change value for headshot/kills for weapon

I want to change the amount of kills or headshots for each weapon individually so I can get the title. None of the trainers I have used to do this, they only allow me to unlock all titles. Is this possible?

also if I do change my level using a trainer and set myself to level 1 at certain prestige, will the game unlock my prestige titles automatically?

1. No just play the game -.-
2. No.

/Solved
-Will be open in case you would find a way.