On PC is there any way to find out how many of the 30 symbols have been read? Perhaps as important is there any way to see which have or haven’t been read?
Not sure if it works differently on pc than it does on console, but the eridian symbols change icons when read.
Open Map, press button for map details (R(?) on PC), you will see how many you are missing. You can check from location/planet/galaxy view. Also as above, different icon on map.