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