Here is the full list of all 34 EARTHLOCK achievements.
Unlocked all prison cells in Karba Prison
Filled the library with mementos
Crafted one of every Perk Talent
Defeated one of every enemy
Completed the game
Equipped a Talent in every available slot
Levelled all characters to level 20
Levelled up all Bonds to level 5
Levelled every type of plant to level 3
Defeated the Hollow Knight
Crafted one of every weapon
Arrived at the Memory Chamber
Received the Lys Aegis Talent from Lady Lumia
Cured Benjo and rescued Bran
Scavenged all scrap piles
Dug up all treasure zones
Released all the barnacles to play on Plumpet Beach
Got all the paintings for Plumpet Library
Released all the Golden Bibis
Gained Gold Rank in all Tournaments
Grew a plant in every garden slot
Planted one of every critter plant
Harvested 10 000 fruits
Liberated the Great Wave
Assembled PAT
Released 50 tormented Ghosts
Opened 50 chests
Olia rejoined the party
Defeated the Mushriga
Rescued Taika from the goblin
Helped Ive after she crashed the plane
Arrived at Plumpet Island
Gnart joined the party
Defeated the Temple Guardian