Super Gunner Icon

[S.Luke [Taiwan]]

My friend told me I got a STG44 super gunner icon, but dont know why it disapear after 2 days. Anyone knows how to get this? I tried to get STG44 award but it's not helping at all. I attach the screen capture for reference.

 

[Duality]

you get one for every class you kill 1000 people with