Here is the full list of all 16 Organic Panic achievements.
Complete every level in Adventure mode
Complete every level in Bonus mode
Complete every level in Coop mode
Splatted an enemy using Coconut's Gravity Power
Drown 20 Enemies
Fry Up 15 Meats
Collect 100 Crystals
Complete the entire game (Adventure, Bonus & Coop)
Get 100 Gold Stars
Run a Veggie Marathon
Smash 5 Enemies in Cherry's Rage Mode
Smash Through A Kiloton Of Ground With Cherry
Squash or Crush a Cheese
Take Out An Enemy With Their Own Weapon
Swim A Mile
Win 100 Versus Games