Complete the following challenges online to unlock the following.

Unlockable	How to unlock
Aperture Sight for Gewehr 43	Get 75 kills with the Gewehr 43
Aperture Sight for M1A1 Carbine	Get 75 kills with the M1A1 Carbine
Aperture Sight for MP40	Get 75 kills with the MP40
Aperture Sight for PPSh-41	Get 25 kills with the PPSh-41
Aperture Sight for STG-44	Get 75 kills with the STG-44
Aperture Sight for SVT-40	Get 75 kills with the SVT-40
Aperture Sight for Thompson	Get 75 kills with the Thompson
Aperture Sight for Type 100	Get 25 kills with the Type 100
Bayonet for Arisaka	Get 75 kills with the Arisaka
Bayonet for Kar98K	Get 75 kills with the Kar98K
Bayonet for M1 Garand	Get 75 kills with the M1 Garand
Bayonet for M1897 Trench Gun	Get 75 kills with the M1897 Trench Gun
Bayonet for M1A1 Carbine	Get 100 kills with the M1A1 Carbine
Bayonet for Mosin-Nagant	Get 75 kills with the Mosin-Nagant
Bayonet for Springfield	Get 25 kills with the Springfield
Bayonet for Type 99	Get 75 kills with the Type 99
Bipod for BAR	Get 25 kills with the BAR
Bipod for Browning M1919	Get 25 kills with the Browning M1919
Bipod for DP-28	Get 25 kills with the DP-28
Bipod for FG42	Get 25 kills with the FG42
Bipod for MG42	Get 25 kills with the MG42
Bipod for Type 99	Get 25 kills with the Type 99
Box Magazine for M1A1 Carbine	Get 150 kills with the M1A1 Carbine
Dual Magazines for MP40	Get 150 kills with the MP40
Extended Clip for Type 100	Get 25 kills with the Type 100
Flash Hider for M1 Garand	Get 25 kills with the M1 Garand
Flash Hider for M1A1 Carbine	Get 25 kills with the M1A1 Carbine
Flash Hider for STG-44	Get 25 kills with the STG-44
Flash Hider for SVT-40	Get 25 kills with the SVT-40
Grip for Double Barreled Shotgun	Get 25 kills with the Double Barreled Shotgun
Grip for M1897 Trench Gun	Get 25 kills with the M1897 Trench Gun
Rifle Grenade for Arisaka	Get 150 kills with the Arisaka
Rifle Grenade for Gewehr 43	Get 150 kills with the Gewehr 43
Rifle Grenade for Kar98K	Get 150 kills with the Kar98K
Rifle Grenade for M1 Garand	Get 100 kills with the M1 Garand
Rifle Grenade for Mosin-Nagant	Get 150 kills with the Mosin-Nagant
Rifle Grenade for Springfield	Get 75 kills with the Springfield
Round Drum for PPSh-41	Get 75 kills with the PPSh-41
Round Drum for Thompson	Get 150 kills with the Thompson
Sawed-Off Shotgun	Get 75 kills with the Double Barreled Shotgun
Sniper Scope for Arisaka	Get 25 kills with the Arisaka
Sniper Scope for Kar98K	Get 25 kills with the Kar98K
Sniper Scope for M1 Garand	Get 150 kills with the M1 Garand
Sniper Scope for Mosin-Nagant	Get 25 kills with the Mosin-Nagant
Suppressor for Gewehr 43	Get 25 kills with the Gewehr 43
Suppressor for MP40	Get 25 kills with the MP40
Suppressor for Thompson	Get 25 kills with the Thompson
Suppressor for Type 100	Get 25 kills with the Type 100
Telescopic Sight for FG42	Get 75 kills with the FG42
Telescopic Sight for STG-44	Get 100 kills with the STG-44
Telescopic Sight for SVT-40	Get 150 kills with the SVT-40
Telesopic Sight for Gewehr 43	Get 100 kills with the Gewehr 43