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