Here is the full list of all 25 Earthlock: Festival of Magic achievements worth 1,000 gamerscore.
Fully level up every type of plant
Defeat one of every enemy
Complete the game
Get to the memory chamber
Rescue Benjo
Fill up the garden with plants
Lady Lumia crafts the Lys Aegis Talent
Craft one of each Perk Talents
Completely fill all the Talent Boards
Return all barnacles to Plumpet Island
Level up all characters to level 20
Complete all Tournaments with Gold Ranking
Fully level up all Bonds between all characters
Find Pat in the warehouse
Open 50 chests
Defeat the Hollow Knight
Olia rejoins the party
Help 50 ghosts to rest at peace
Defeat the Mushriga
Harvest 1000 fruits
Rescue Taika from the Bandit
Help Ive from the crashed plane
Arrived at Plumpet Island
Gnart joined the Party
Defeated the Temple Guardian