Woodland spirit achievement bug?

[Guars]

so, i've already completed all contracts from the base game but i'm still missing the woodland spirit achievement (i already have The Professional achievement), did i had to kill the leshen to get the achievement?

[Patriot]

Yes, you must kill him.
If you helped Harald instead of Sven, you will not get the achievement.
Help Sven to do it.

[xPowsin]

This achievement is so buggy. The one that worked for me was , never talking to harald, have Hilde sacrificed , never approach the altar , then kill the leshen. No achievement popup appeared for me so I alt tabbed , the achievement is marked complete.