I don't know for sure in Black Ops 2, but in MW3, humiliation was composed of 17 challenges :
Hot Potato I. Kill 5 enemies with thrown back grenades.
II. Kill 10 enemies with thrown back grenades.
Car Bomb I. Kill 5 enemies by destroying cars.
II. Kill 10 enemies by destroying cars.
Backstabber Stab an enemy in the back with your knife.
Slow But Sure Kill an enemy while being stunned by a stun grenade.
Misery Loves Company Kill yourself and 1 enemy by cooking a grenade without throwing it.
Ouch Kill an enemy with a rifle-mounted grenade launcher without detonation. (Direct impact)
Rival Kill the same enemy 5 times in a single match.
Cruelty Kill an enemy, pick up his weapon, then kill him with his own weapon.
Think Fast Finish an enemy off by hitting them with a frag grenade. (Direct impact)
Think Fast Stun Finish an enemy off by hitting them with a stun grenade. (Direct impact)
Think Fast Flash Finish an enemy off by hitting them with a flash grenade. (Direct Impact)
Return To Sender Kill 1 enemy by shooting their own explosive.
Blindfire Kill an enemy while you are still dazed by a flashbang.
Hard Landing Kill an enemy that is in mid-air.
Extreme Cruelty Kill every member of the enemy team (at least 4 enemies) without dying.
Tango Down Kill every member of the enemy team. (4 enemy minimum)
Counter-MVP Kill the #1 player on the enemy team 10 times in a single match.
They must be pretty close to that in Black Ops 2.
Edit : BTW, source is Call of Duty Wikia