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