Is it possible to make this adventure maps using Open Street Map?
You might want to have a look at https://opentopomap.org/
It is a map with relief shading similar to the one in the screenshot you’ve posted
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There are some renderings that combine OSM with hill-shading. The casing of the areas of interest (maybe) and the leaders (certainly) you may/will have to create yourselves. A number of GIS packages can consume openstreetmap data, no idea here, which one can create the leaders.
Unfortunately the map isn’t super detailed in that area, which might be a roadblock even if you can technically do it. So I’d at least make sure the things you’d want in your map are in OpenStreetMap before spending the time on it.
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