I was going to state I asked for an official response about this back when I started playing and Hinterland said burned buildings don't affect the achievement. I also completed it on Voyager.
Either you missed a building you were not aware of (consult a map), or there was a bug.
If you used a map and you definitely went inside all interiors including the mine in CH (I believe the mine was necessary), the only bug I can think of is the ML lake cabin teleportation bug that I believe they have patched...Where you go inside one lake cabin, but you are actually teleported to the interior of the wrong lake cabin.... (Yes, this was an actual bug I'm not making this up...)
Asked a million times...historically, if you search the forums....
But I agree it should be added, especially since they added these little cliffs you can climb with Wintermute, but I can't ge over a waist high wooden fence in Pleasant Valley....
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