Here is the full list of all 25 EARTHLOCK: Festival of Magic achievements.
Fully level up every type of plant
Fill up the garden with plants
Complete the game
Get to the memory chamber
Defeat one of every enemy
Rescue Benjo
Completely fill all the Talent Boards
Level up all characters to level 20
Craft one of each Perk Talents
Defeat the Hollow Knight
Lady Lumia crafts the Lys Aegis Talent
Return all barnacles to Plumpet Island
Open 50 chests
Complete all Tournaments with Gold Ranking
Fully level up all Bonds between all characters
Harvest 1000 fruits
Defeat the Mushriga
Find Pat in the warehouse
Olia rejoins the party
Help 50 ghosts to rest at peace
Rescue Taika from the goblin
Help Ive from the crashed plane
Get to Plumpet Island
Gnart joins the party
Defeat the Temple Guardian