In my Let's play, I build up Amara to level 65, without using the mayhem modes. After that I reset the playthrough and played the story at Mayhem Mode 11, picking up missing red chests, area's and eridian writing along the way. Now I finish the 100% (in real terms, not using the calculation skills from Gearbox).
Part 1: Tying up loose ends and trials
In my playthrough I missed 1 mission, Fire in the sky, because I didn't know it existed. I discover the slaughter area's and trials. One map is missing a named area and 2 maps are missing the Eridian writing. There are also 2 red chests not found yet, because they are in a map that is not part of the story. After getting all that, I do the 6 trials.
At this time, Skipvogel has 285 views for Borderlands 3 spread across 37 videos. This game accounts for over 3 days of watchable video on his channel, roughly 36.39% of Borderlands 3 content that Skipvogel has uploaded to YouTube.