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Assault Rifles are good all-around weapons. They work well at long range, while keeping accuracy and power for close combat. These weapons work well in any game mode, on any map, for any occasion. The best way to get these challenges is to play, play, play! Most of them simply involve a large number of kills, so pick your weapon of choice and don't put it down until you're done. See
this online weapons guide for tips using individual assault rifles. In general, Stopping Power is always useful, and Steady Aim can help with close-quarters accuracy.
Marksman
The Marksman challenges are the most basic weapon challenges of all. Kill X number of people with the gun of your choice. Any map, any game type, simply kill people with the assault rifle you have on hand. The Marksman challenges unlock attachments for the rifles.
Marksman I: Kill 10 players. Unlocks the M203 underbarrel grenade launcher and gives you 250 EXP.
Marksman II: Kill 25 players. Unlocks the Red Dot Sight and gives you 1,000 EXP.
Marksman III: Kill 75 players. Unlocks the Silencer and gives you 2,000 EXP.
Marksman IV: Kill 150 players. Unlocks the ACOG Scope and gives you 5,000 EXP.
Marksman V: Kill 300 players. Unlocks FMJ Rounds and gives you 10,000 EXP.
Marksman VI: Kill 500 players. No unlocks, but gives you 10,000 EXP.
Marksman VII: Kill 750 players. No unlocks, but gives you 10,000 EXP.
Marksman VIII: Kill 1,000 players. No unlocks, but gives you 10,000 EXP.
Expert
The Expert challenges are much like the Marksman challenges, but slightly more difficult. Instead of simple kills, you have to kill the players with headshots for the kill to count toward the challenge. These challenges unlock camo color schemes for the rifles.
Expert I: Headshot 5 players. Unlocks Woodland camo and gives you 500 EXP.
Expert II: Headshot 15 players. Unlocks Digital camo and gives you 1,000 EXP.
Expert III: Headshot 30 players. Unlocks Urban camo and gives you 2,500 EXP.
Expert IV: Headshot 75 players. Unlocks Blue Tiger camo and gives you 5,000 EXP.
Expert V: Headshot 150 players. Unlocks Red Tiger camo and gives you 10,000 EXP.
Expert VI: Headshot 250 players. Unlocks Fall Camo and gives you 10,000 EXP.
Expert VII: Headshot 350 players. No unlocks, but gives you 10,000 EXP.
Expert VIII: Headshot 500 players. No unlocks, but gives you 10,000 EXP.
Miscellaneous
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These challenges include kills with the attachments you unlock with the Marksman challenges. Of these, the only difficult ones are the grenade launcher and FMJ challenges. For the grenade launcher, use Danger Close and either Scavenger or One Man Army. Danger Close will improve the blast radius and damage of grenades. Scavenger will allow you to resupply ammo from people you kill, and One Man Army will allow you to switch to the same class you currently are using, refilling your grenades. For the FMJ challenges, either use the Bling with the heartbeat sensor and FMJ to shoot at people through walls, or shoot through thin metal surfaces such as the chain link fences and metal catwalks in Quarry. Also, unbroken glass windows count, so don't break them before you shoot through them!
Shotgun: Kill 20 players with the grenade launcher. Unlocks the underbarrel shotgun and gives you 750 EXP.
Holographic Sight: Kill 60 players with the Red Dot Sight. Unlocks the Holographic Sight and gives you 1,000 EXP.
Heartbeat Sensor: Kill 15 players with the silencer. Unlocks the Heartbeat Sensor and gives you 750 EXP.
Thermal Scope: Kill 20 players with the ACOG Scope. Unlocks the Thermal Scope and gives you 750 EXP.
Extended Mags: Kill 40 players by shooting through surfaces with FMJ Rounds. Unlocks Extended Mags and gives you 1,000 EXP.
Master: Unlock all attachments for a weapon. Unlocks a weapon mastery title and gives you 10,000 EXP.
