I think the best path to gain all knowledge would be:
start as a beast, gain all knowledge on Arboreus (much easier then having half hour limit and heavy debuff each time, and also the only possible way to get a knowledge from good only zones)
Alongside collecting Arboreus knowledge, slowly collect Syndesia knowledge as well
Once you have all Arboreus and Syndesia knowledge, go full evil, turn to Abomination, chose Bablis, and start doing Tartaros knowledge till you have it all
After that, stay abomination if you want to play evil, or work your way back to good side if you don't.
Other way around it will be super hard. I have to say that knowledge gain system is quite unbalanced in favor of Beast Men here.