Here is the full list of all 25 Earthlock: Festival of Magic achievements worth 1,000 gamerscore.
Open 50 chests
Complete all Tournaments with Gold Ranking
Help 50 ghosts to rest at peace
Find Pat in the warehouse
Harvest 1000 fruits
Olia rejoins the party
Defeat the Mushriga
Rescue Taika from the Bandit
Help Ive from the crashed plane
Arrived at Plumpet Island
Gnart joined the Party
Defeated the Temple Guardian
Received the Lys Aegis Talent from Lady Lumia
Rescued Benjo from the Karba Prison
Arrived at the Memory Chamber
Completed the game
Defeated one of every enemy
Levelled every type of plant to level 3
Grew a plant in every garden slot
Crafted one of every Perk Talent
Levelled all characters to level 20
Levelled up all Bonds to level 5
Equipped a Talent in every available slot
Released all the barnacles to play on Plumpet Beach
Defeated the Hollow Knight