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