Ok this is how I got the shotguns:
Play 50 games in which you reach round 15 or higher.
Have at least 100 miles traveled
Thanks to : makaveli7101 for that idea which worked for me, and a lot of his friends.
Here is a picture of my stats of when I achieved the shotties:
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Incase it's blurry or doesnt work:
Kills: 63853
Downs: 112
Miles Traveled: 125
Revives: 172

I got the shotguns after one terrible round 16 game on Die Rise in which I had 3 downs since we messed up in the beginning.

To add to that I upgraded from knife to shotguns after Exactly 20,400 kills no rounding over there.

Here's a picture of my stats as soon as I achieved the knife.

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I got the knife after one round 22 game on tranzit with no downs in custom games on easy (we ended the game).