So I am try to get the "shotgun combo" achievement, I pulled it off but got no credit for it. Not on the screen at the time of the action, nor after refreshing the achievement screen. I only have 1 good shotgun X, and I used the level 4 adv. shotgun for the other piece of the combo, so what gives?

Only the Shotgun X and the mythical shotguns count for the achievement.

So you are saying it is broken when the gun called "shotgun" doesn't achieve the "shotgun combo"? Will supermechs team fix it?