Originally Posted by BF3Blog
"The Back To Karkand DLC brings something new to Battlefield 3 (in addition to new maps, weapons etc.): Assignments, which is a new way of unlocking the new weapons found in Back To Karkand."


FAMAS ("Best Friend Forever" assignment)

* 10 heals
* 10 revives


L85A2 ("Professional Russian")

* 100 kills with assault rifles
* 20 kills with grenade launcher
* Win 5 rounds of Squad Deathmatch


MP5 / HK53 ("Fixing it")

* 10 repairs
* 1 kill with repair torch


QBZ-95B ("It Goes Boom")

* 50 anti-tank rocket kills
* 5 conquest round wins
* Destroy 1 enemy vehicle with repair torch


QBB-95 ("Let It Rain")

* 20 kills with light machine guns
* 2 mortar kills


QBU-88 ("Specops")

* 20 sniper rifle kills
* 5 laser designator assists


MG36 ("Keep Your Head Down")

* 100 kills with light machine guns
* 50 suppression kill assists
* 50 ammo resupplies


L96 ("Creeping Death")

* 50 headshots
* 50 spot assists
* 5 knife kills


PP-19 ("Familiar Territory")

* Capture 10 flags
* Arm 10 MCOM stations
* Play 2 hours on Strike At Karkand


Jackhammer / MK3A3 ("Scarred Veteran")

* 10 kills with PP-19
* 10 kills with BTR-90
* 5 kills with DPV jeep
* Play 2 hours on Gulf of Oman
* Play 2 hours on Sharqi Peninsula


Source: BF3Blog | List of Battlefield 3 assignments