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