Why can't we have our controller unplugged if the controller support is enabled on PC I can't even get rid of the notification saying to plug in a controller without a controller other games will run just fine without a controller with the controller control scheme enabled why not this

I want to complete the achievement that requires me to kill someone in a match with 4 people at least. I've got 1 person with me already so I only need 2 more. I'd be grateful if you could play with me, and if you don't have the achievement either I can let you kill me too.