Cartographer

Acquire a map for every mappable area. Cornifer the mapmaker hides in each region, humming to himself - follow the sound, buy that area's map from him, and thereafter Iselda in Dirtmouth sells pins and updates. You need his map for every zone (Deepnest and Kingdom's Edge are the ones people forget). Buy Cornifer's map in each area and this ticks over. Feeds into Completion.