Here is the full list of all 13 Soul of the Forest achievements.
Get a Mega Hit!
Collect all of the ants in the forest!
You traveled 1000 feet in the overworld!
Calm Ollie down...
Convince the mob you're on their side!
Kick a clown to the curb
Defeat the hero one last time... without taking damage!
Defeat the hero once and for all...
Defend the village!
Defend yourself from the "Hero"
Convince the fungi to help save the forest!
Slap some sense into the Council of Deer!
Free your horse friend from the Ant Army!