It's only 100%, the original HK went over due to updates. That said, bestiary progress doesn't count towards percentage luckily. You do not need to kill every enemy to get 100%.
I'm 9 hours in and just beat Moorwing (annoying... took me between 10 and 15 tries) and Sister Splinter (beaten on second try!). I love this game. So carefully crafted. Full of little touches everywhere. It's a delicacy
You don't have to but I highly recommend starting with the first, since it's a lot easier and is still an excellent game. The second one sort of assumes you've played the first, so it starts out way harder and doesn't explain its mechanics as much.
Fuck you, congratulations. Back to hunter's march for me....
Hahaha, have fun.
If it's any consolation, I did find act 2 to be easier than act 1. Keep at it.
what about act 3 though