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