Here is the full list of all 17 Soma Spirits: Rebalance achievements.
Complete Mysterious Woods
Defeat a Penny Candy or Pouty Candy
Complete Box World.
Complete Freezing Fjord.
Complete Maltose Mines
Complete Phantasmal Chasm
Complete the game with any ending.
Complete Ending 1.
Complete Ending 2.
Complete Ending 3.
Complete Ending 4.
Complete the True Ending.
Settle the score with the Cooler Crusader.
Defeat The Puppeteer.
Defeat The Puppeteer on Hero difficulty on the first New Game+.
Redeem all 10 Sun Medals.
Show a profound appeciation for nature.