For example, if at one kill you unlock Assassin, you will be completing Assassin challenges while also completing the 'Assassin' Specialist challenge.

You will be completing the perks, and each perk has a Specialist perk challenge to it. It will also help you complete the perk's challenges and the Specialist challenges for each perk. You will get extra points at kills 1, 3, 5, and 7. Create a class with the Hardline perk and use the Specialist Killstreak package. Once you reach Level 20 in Multiplayer mode, use the Specialist Killstreak package to get a lot of extra XP.

will get double XP for the rest of the match. Additionally, the team with the person who calls in a M.O.A.B. When activated, it will kill all enemies on the map, no matter where they are, as well as disable the enemy's equipment, electronics, and pointstreaks for one minute. Get a 25 (24 with Hardline) killstreak using only your gun/knife/equipment (killstreak kills do not count) to get a M.O.A.B. Reach Level 31 in Multiplayer mode for a weapon by getting 1,000 kills with it to unlock the Gold camo for the weapon.

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