Here is the full list of all 25 Spirit Roots achievements.
Defeat the Cornthrower
Defeat the Leshy
Defeat the Scorpion
Defeat the Ssspider
Defeat the Skooll
Finish the Village stage
Finish the Swamp stage
Finish the Wasteland stage
Finish the Dark Wood stage
Finish the Icepiece stage
Defeat all the bosses
Finish the level without dying
Finish the level with 3 stars
Finish the level without using a gun
Finish all levels with 3 stars
Die from the thorns
Die 30 times
Plant all the beans in the game
Die close to the finish
Replay the level 10 times
Jump on the mushroom 10 times without touching the ground
Kill enemy while slipping
Finish the level without using the sword
Finish the level without kills
Defeat enemy in while being in swale