Borderlands 3 tracks zone completion percentages, which you can view on a map-by-map, planet-wide, or galaxy-wide basis. The objectives that make up each map's percentage can be seen in this answer. However, there are several issues that make "100% completion" hard to determine:

  • The displayed totals for the challenges on the maps are often incorrect, and you can end up with e.g. "3/2 Fast Travels" or "10/8 Crew Challenges." The discrepancies get even worse when you look at the aggregate totals for a planet or the whole galaxy.
  • Some missions, mostly repeatable ones, count toward the map's mission total, but without the mission being tracked in your quest log. The Proving Grounds missions have this issue, for example.
  • Some missions count toward your galaxy mission total only, and aren't tracked by any specific map's mission total or in your quest log — namely, the "kill rare spawn" missions.

As a result of all this, my friends and I have reached a galaxy-wide completion percentage of 110%. Is this the highest possible? If not, what is?

  • I’ve found that relogging sometimes sets my Galaxy percentage back to 100%. However, upon doing something in game it can change again. It’s weird. 100% of the game (TO ME- THIS IS MY OPINION) includes; All Crew Challenges completed, All Eridian Writings found/scanned, all Slaughter’s done(There are 3), All Proving Grounds completed (There are 6), Completion of the Maliwan Blacksite, Completion of All Side Missions, Main Missions, and DLC missions/Crew Challenges, All In-Game Achievements, All Red Chests, All Named Locations, Optional: All Echo Logs Found. Echo Logs do not count toward anything – Hello There Feb 7 '20 at 0:00

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