Achievement Hunting: Master of Arsenal

Hello all, I am on the quest to 100% Space Marine 2. I am on PC so everything is Steam. The achievement, Master of Arsenal, states on Steam: "As a Tactical, kill 25 enemies with every available Primary Weapon"

It does not clearly state if that is Operations or Multiplayer. Only 2.5% of players have it on Steam. Does anyone know if it's Operations or not? I should have it by now, so I was wondering if it's multiplayer. And does this now include the new Pyro flamer?

I would appreciate any information. Thank you.