The first Achievement is called "Imperishable night" which requires you to maintain nightsouls state for 18 seconds or more. This achievementment is much easier if you have Mualani but can be achieved using any Natlan character.
The way I nabbed it was to ride the Spiritway using a Natlan character. This will also give you the hidden achievement "High-Speed Lifting" if it is your first spiritway!
The challenge I recommend doing this on is located here:
Grab the life ring by the opposite bank and complete the circle to activate the puzzle.
I tried doing this challenge with the beast but it was frankly too annoying 🤪
Using the character nabbed me a 100% on the challenge and both achievements much easier!!!
