Army of Two: The 40th Day

This achievement requires you to score a kill with every weapon of every kit in versus, including the grenade launcher and RPG, which are found on the map. Start by using Assault Kit 1, score a few kills with the first weapon, then repeat with the second (it may seem a bit confusing at first, but you only need to down them, then ensure they die by some way). After you've gotten a few kills with both weapons in the kit, simply switch kits and repeat the process. Along the way if you spot an RPG or grenade launcher in co-op deathmatch, be sure to pick them up for a single kill as well.

Note: Some weapons appear multiple times, in two kits. It is unknown if you need to score kills with the weapons on both kits, so just go ahead and score kills with them anyway.

This may be earned over the course of multiple sessions of play.

Seraphim Needed states, "The VIP's during Warzone when the VIP objective comes up also get access to the Grenade Launcher as a 3rd weapon." That makes it easier for a Grenade launcher kill.

Along the way, you will unlock the Job Seeker achievement as well.
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Kits:

~ Assualt Kit 1
SCAR-L Assault Rifle
G18C Pistol

~ Assault Kit 2
Felin-2C Assault Rifle (w/scope)
TD-V .45 SMG

~ Close Combat Kit 1
AA-12 Shotgun
MP5 SMG

~ Close Combat Kit 2
R870 Shotgun
M-416 Assault Rifle

~ Sniper Kit 1
VSS Sniper Rifle
TD-V .45 SMG (repeat)

~ Sniper Kit 2
M107 .50cal Sniper Rilfe
Type 77 Pistol

~ Commando Kit 1
AK-47 Assault Rifle
DE-0 .44 Pistol

~ Commando Kit 2
G36 Assault Rifle (w/silencer)
Type 77 Pistol (w/silencer)(repeat)

~ Weapons on Map
RPG Launcher (only found on Co-op Deathmatch)
Grenade Launcher (only found on Co-op Deathmatch)

(Special thanks to XD MR CLUTCH XD for special weapons comment)
(Special thanks to UGotta Check It for game sessions comment)