(adsbygoogle = window.adsbygoogle || []).push({}); Alright so what your going to want to do is to go on your call of duty elite profile ( I did on my computer). Go to your black ops 2 career page. Then go to challenges. Then go to game modes then go to demolition. Then check if there is a challenge you have not completed. There apparently is a hidden challenge which is the only one i dont have completed.
You must login or register to view this content.
I have 10/11 challenges completed it says. You may have others incomplete just check the list on elite and see if it matches up with your game.
Hers is what i showed to DV
You must login or register to view this content.

Right Now im working on that challenge so i'll reply back here to confirm later.
Hope this works for you all

btw I bet the reason no one had completed that challenge is because almost everyone in demolition lets the other team blow up a bomb so they have more time to kill.

You have that challenge already completed man...it's the challenge above Demolition Master.

No id ont have it completed it was just awarded wrongly cause i know for sure i have not played 10. Like how gold was unlocked rarely before all the challenges were completed

I did. I did one challenge at a time and I still don't have the title.