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Sentry Gun
Harrier
Pave Low
Attack Helicopter
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Step 1. Set your killstreak to desired Challenge
Step 2. Go into Cage Match or Domination/Free For All (with friend)
Step 3. Get kills (use hardline) that you need for killstreak
Step 4. Partner dies to it (ALOT)
Step 5. Enjoy the title

Example -
Say i want Gold Skull Sentry Gun title

Step 1. Set killstreak to Sentry Gun and use Hardline
Step 2. Enter Free For All (i like it better than Cage Match)
Step 3. Shoot partner 4 times
Step 4. Call Sentry Gun (AWAY from everyone else)
Step 5. Repeat Step 2-5 Untill obtaining 1000 Kills

~ Some Math ~
Gold Skull title - 1000 kills
Sentry Gun = 4 Kills (with hardline)
20 - 4 = 16
16 Sentry Gun Kills per game
1000 / 16 = 62.5 (or 63)
^ Is how many games youll be playing (63)
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Also!
16x63= 1008
Your getting +1008 Kills and >>0<< Deaths!
MEGA!!! KDR Boost (about .5-.6 [depending on your kills/deaths])
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Hope this helped! If so please Rep/Thanks/Nominate!

...im off to go do this laters!

this is not a new discovery...this is a simple thread to help people who havent thought of this or forgot about it

awesome, thanks for this. though, you might want your partner to make a new account if he is going to die 1000 times :p

Yeah alot of us already knew this but good post anyways.

cool but it will take a long time

This is common sense and obvious but it helps.

Confirmed:
The Join a TDM game then back out and go into cage match and your friend leaves the tdm game and auto goes into cage match

I Did it last night

Also, Join Session and Invite To Game still works

Super easy

stupid ****ing post

just posting for help...many people found this usefull