Messing around with Floating Aloy Glitch, found that it still persists if you fast travel, might be useful.

I found a few things during my Casual Playthrough. 1. When jumping, if you wiggle back and forth, you gain a slight amount of height, which can allow you to make some jumps you couldn't before. 2. If using the Double Up/Triple up perk, if you do the loading input while rolling, you will load an arrow without the animation. Along with this, the number of arrows stocked is saved per bow. So if you get three arrows notched on your shadow bow, and switch to your War bow, those three arrows will still be stocked if you switch back to the shadow bow, as long as it's the same arrows as before. 3. I seemed to get a lot of animal bones when I killed wildlife with fire arrows. Not much grounds for this one, so it would need to be tested. I'll keep you guys posted if I find anything else.

A category that encompasses all the training ground quests would be good. The catefory would consist of completing all 15 training ground trials with top marks. Anything would be allowed, so it's would be an end game type category. I for one would love to see the strats used for it.