You hav to pristege aND GET 10 kills wit a silencer on ure gun afta unlokin challenges
10 kills with a silenced weapon after you prestige
Kill 100 enemies while using a silenced weapon.
Prestige and get 25 kills with a silenced weapon. Hope this helps :)
10 kills with a silenced weapon must be 1st prestige
Killing 100 enemies with a silenced weapon after Prestiging.
Reach Prestige 1 and Level 69.
Complete the challenge: "Stealth: I" - Kill 10 enemies while using a silenced weapon.
Get stabbed by someone who has that title set as his active callsign.
Get to ninth prestige
you have to get 250 kills with melee
No
Use a title that is really hard to get. Such as a 2500 with the spas 12 title Thats what I have ;)