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Open the map and add this to the map LUA script.
It should open the map (top and underground) for player 1 on day 1 (try skipping a day if it does not happen on day 1)
I've also learned how to do it through the console:
enable cheast + @OpenCircleFog(0, 0, 0, 9999,1) + @OpenCircleFog(0, 0, 1, 9999,1) and it opens the entire map, including the underground.
However, after looking at the map a couple of times to see what's where, I stopped doing it – I already have enough knowledge to plan where to go for artifacts of a certain level, and what those artifacts are – those are just details and not so important. The main thing is to understand the general layout.
Thanks again for your support.