I'm sure they could set some kind of in-game flag for achievements that is checked in menu screens to update the "real" Steam achievements.
Also, I would like to see minimalistic achievements. You could even use them as little memorials, especially if you don't get them until in menu. I could enjoy looking through a list of achievements with the name of an area and some artwork as a reminder that I finished it. No corny subtext, no "break 50 pots". You could even do away with the names and just go with images.
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