Centurion
Dark Council Elite
Zone 1 is clear too, it is where the first dungeon was with ClainJust made a tally of explored areas. Not entirely sure if this is still happening, but here's a slightly updated picture. Some events have not happened whatsoever, so if someone can inform any changes, I can fix them relatively easily. Red is a finished exploration, and Gray is a Upcoming/Unsure exploration.
View attachment 74390
Edit: Minor update, threw in some dates/TBD for unknown ones that I still believe are happening.