I have two bugs in my challenges including missing 1 out of all 80 runes. More specifically, I am missing a rune in Vasa's Triumph. After looking for it for over 100 hours and two different online 80/80 guides, I am 99% sure it is bugged and nonexistent. This means I can't get the distinguished Explorer challenge. Also, I am also missing the Uncommon through Masterwork javelin challenges that I need in the Legendary Freelancer challenge even though the actual challenges are shown as completed. With those 2 things missing, it is impossible to complete the Legendary Freelancer Challenge.
The reason I am saying this is because I think it would be a giant headache, if even possible, to specifically fix these things for everyone that is having trouble. I think what should ideally be done is by opting-in to reset the challenges. Even though it is drastic, I would prefer to do this instead of having this one giant challenge incomplete and everything else finished. It would feel a giant thorn in my side. Also, I refuse the advice to make a new character and completely start over. There's no way I am completely throwing away 200 hours of gameplay.
Also just a fyi, I already reported both bugs a little while ago.