get 2500 klls with all guns after having prestiged once at least
By completing the mastery challenges
There are 512 titles in MW3.
Yes, you can i did it in the last level of mw3
unstoppable
By Completing challenges
the Fmg9 akimbo(costom) is the best secondary weapon to use
The China Lake is a secondary weapon, and the last weapon unlocked for Create-A-Class, unlocked at Level 48. It is not available in MW3
Weapon level 5
the tompson I Whould Just Play Mw3
look at call of duty wiki
you can't find it here but what you can do is look on the leader boards then look at hit titles and emblems and there you go
Get 3 kills in one life with your secondary weapon
You get 100 or 200 kills with your second primary weapon