I can pretty much confirm that the "Professional Scavenger" Achievement cannot actually be obtained. (I should have known, since it has a 0.0% completion rate). I played through the campaign a second time just to hunt this one, and easily collected 15 or more mechs through 8-part salvage (without buying parts from stores, even), completed the final mission of the campaign, and still didn't get it..

Also I understand there's an achievement for Dekker surviving the campaign (and being present during the final mission?). Didn't get that one, either. In fact, the only notable achievements I got during that whole second playthrough were maxing out certain mechwarrior stats and headshotting an Orion with an AC20.

Has anyone managed to get these particular achievements? Are there unstated requirements to getting them? If these are ever fixed, would I have to play through an entire additional campaign to get them? (I probably won't)

you can try reverting to the first version cause on steam forum it reportedly broken at 2018-12-17 probably if u try the first version it would worked