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