Whats rewards for 300m, 400m, 500m headshot and maybe more?

https://preview.redd.it/q943t8j3t91g1.png?width=1920&format=png&auto=webp&s=43537c2a8a76aeecee95e2cf5d59811f5c12ee0d

Is not here Challenges tab but completed 400m+ missions. Whats rewards, hint rewards soon or bug?