Payback Challenges - Level 47
Payback challenges are, as it sounds, all about getting payback. To get payback, you have to kill a player than has recently killed you. You can only get payback once after being killed by that player; to get it again, you need to be killed by them again. Perhaps the hardest part about getting payback challenges is finding the players that killed you and killing them in the specific way required. In general, just play the game. Many, such as getting payback with headshots, will simply happen as you play. Some, like getting payback with a copycat class, requires something special from you. All of these challenges are unlocked at level 47.
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Time is Money I and II - Get Payback 5 and 25 times with Semtex grenades. Worth 3,500 and 10,000 EXP respectively. Challenge I unlocks the Time is Money title, and challenge II unlocks the radiation emblem. This challenge is relatively easy to get through the course of normal gameplay. Just throw semtex grenades and try to kill people. Unless you're amazingly good, you'll have died a few times, and thus some players will get you payback kills.
I'm Rich I and II - Get Payback 5 and 25 times with C4. Worth 3,500 and 10,000 EXP respectively. Challenge I unlocks the I'm Rich title and challenge II unlocks the Seasnipers emblem. Slightly harder than payback with semtex, C4 packs are just as deadly if you use them properly. Kill people with them when you can and you'll eventually get the payback kills you need.
Color of Money I and II - Get Payback 5 and 25 times with heashots. Worth 3,500 and 10,000 EXP respectively. Challenge I unlocks the Blood Money title and challenge II unlocks the close-up skull emblem. Headshots are a good way to kill players and they complete dozens of challenges, so getting payback with them will be par for the course. Chances are you'll have done this twice over by the time you even unlock it.
Robin Hood I and II - Get Payback 5 and 25 times while in Last Stand. Worth 3,500 and 10,000 EXP respectively. Challenge I unlocks the Robin Hood title and challenge II unlocks the cartoon price emblem. This challenge is tricky. It doesn't work in Final Stand, for one. For two, dying, being put in last stand, and killing the person that killed you doesn't count. A person has to kill you, and then kill you again, and while in last stand that second time, you kill them. This makes this challenge difficult. However, playing with last stand constantly should get you the kills you need eventually. Just keep at it.
Bang for your Buck I and II - Get Payback 5 and 25 times with Frag grenades. Worth 3,500 and 10,000 EXP respectively. Challenge I unlocks the Mad Man title and challenge II unlocks the 8-ball emblem. This is another challenge almost as easy as the semtex paybacks. Use the same tips mentioned there, just use Frag Grenades instead.
Overdraft - "Get a payback that sticks to the victim," Get a payback by sticking the enemy with a Semtex Grenade. Worth 3,500 EXP. Unlocks the Rainmaker title and the Soap emblem. This one you just might get along the way with semtex paybacks. Just stick the players with the grenade and you'll be good.
Identity Thief - Get a payback with the killer's copycat class. Worth 3,500 EXP and unlocks the ID Thief title and the copycat emblem. If you use Copycat, you'll find this easy. If you don't, you'll have to pay attention to get it. Fortunately, the better the player that kills you, the more likely you are to be able to kill them with their own class.
ATM - Get a payback with a throwing knife. Worth 3,500 EXP and unlocks the New Jack title and the talon emblem. Like the other payback challenges, simply use the throwing knife and eventually you'll kill someone with it that killed you previously.
Money Shot - Get a payback with a game-winning killcam. Worth 3,500 EXP and unlocks the Money Shot! title and the night vision emblem. This one isn't really one you can plan; just try to get the last kill in a match and hope it's someone that killed you previously.
Break the Bank - Get payback with a claymore. Worth 3,500 EXP and unlocks the Dishes are Done title and the woman's head emblem. This one is pretty easy too. Just drop claymore everywhere and you'll rack up the kills.