Here is the full list of all 52 Lone Fungus achievements.
Fullfill your destiny on the 'Nightmare' Difficulty (True Ending)
Achieve 100% completion and finish the game on the 'Nightmare' Difficulty (True Ending)
Parry 200 Projectiles
Fullfill your destiny on the 'Normal' Difficulty (True Ending)
Fullfill your destiny on the 'Hardcore' Difficulty (True Ending)
Achieve 100% completion and finish the game (True Ending)
Collect all Astral Fragments
Collect all Relics
Fully upgrade your sword's damage
Open all levered one way gates
Collect all Emblems
Collect all Ladybugs
Collect all Brain Nodes
Talk to every Major Statue
Unlock all Bounce abilities
Collect 75 Mindshrooms
Learn everything you can from the Grand Librarian
Listen what the Professor Statue has to say about each mushroom cap
Leave the Kingdom (Abandonment Ending)
Downward Slash the Bouncy Spore 5 times in a row without touching the ground
Read all the 'Ten Commandments' tablets
Acquire the Spark Ball Spell
Complete the game (True Ending / Selfish Ending)
Forget the past, reincarnate only the Greencap culture of mushrooms (Selfish Ending)
Collect all Health Crystals
Use the Bouncy Spore Spell to reach somewhere higher up
Unlock the Royal Ornament
Learn both Great Slashes
Unlock the Teleportation Wand
Acquire the Vibrant Crystal Spell
Collect all Spell Stones
Acquire the Golden Light Spell
Unlock the Fire Bounce ability
Collect 50 Mindshrooms
Acquire the Spicy Nut Spell
Acquire the Berserk Spell
Unlock the Wall-Bounce ability
Acquire the Acid Hammer Spell
Unlock the Spin Jump
Cut 1000 Flowers/Flora
Acquire the Returning Contraption Spell
Defeat 500 Enemies
Acquire the Bouncy Spore Spell
Collect 25 Mindshrooms
Collect 4 Health Crystals
Unlock the Crouch Jump ability
Acquire the Bouncy Ball Spell
Unlock both the Dashes
Acquire the Boost Projectile Spell
Defeat 100 Enemies
Learn how to Conjure a Mushmover
Unlock the Mushmover Infusion ability