Here is a guide on how to obtain each achievement in Hollow Knight: Silksong.
Achievements Part 1
Equipped
Acquire your first Tool
Bound
Bind your first Silk Skill
Claimed
Claim your first Crest
Restored
Acquire 2 Spool Fragments
Liberated
Defeat the Bell Beast
Pharloom’s Welcome
Defeat Lace in Deep Docks
Servant
Defeat Fourth Chorus
Granted
Grant your first wish
Resident
Acquire your own Bellhome
Protected
Acquire 4 Mask Shards
Transported
Open all of the Citadel’s Ventrica Stations
Keen Hunter
Grant Nuu’s wish
Flea Finder
Rescue half of Pharloom’s lost fleas
Fanatic
Defeat Widow
Last Dance
Defeat the Cogwork Dancers
Tragedian
Defeat Trobbio
White Knight
Defeat Lace in the Cradle
Harmonious
Learn the Citadel’s Threefold song
Extended
Acquire all Spool Fragments
Connected
Open all of Pharloom’s Bellways
Bonded
Hidden achievement: Learn the Beastling Call
Judge
Defeat the Last Judge
Grey Ghost
Hidden achievement: Defeat Phantom
Heretic
Hidden achievement: Defeat First Sinner
Achievements Part 2
Glutton
Satiate the Grand Gourmand
Trail’s End
Grant Shakra’s wish
Weaver Queen
Hidden achievement: Defeat Grand Mother Silk and bind her power
Snared Silk
Hidden achievement: Defeat Grand Mother Silk and entrap her with the Soul Snare
Arsenal
Acquire all Tools
Woven
Bind all Silk Skills
Consumed
Claim all Crests
Masked
Acquire all Mask Shards
Regenerated
Acquire all Silk Hearts
Cartographer
Acquire a map of each area
True Hunter
Receive the Hunter’s Memento
Fleafriend
Rescue all of Pharloom’s lost fleas and receive their final gift
Tyrant
Hidden achievement: Defeat Crust King Khann
Seed
Hidden achievement: Defeat Nyleth
Diva
Hidden achievement: Defeat Skarrsinger Karmelita
Lamenter
Hidden achievement: Defeat the Clover Dancers
Hero’s Call
Hidden achievement: Defeat Lost Garmond
Fatal Resolve
Hidden achievement: Defeat Pinstress
Entwined
Hidden achievement: Bind Eva
Remembrance
Hidden achievement: Claim the Everbloom from within a distant memory
Twisted Child
Hidden achievement: Defeat Grand Mother Silk while cursed
Sister of the Void
Hidden achievement: Defeat Lost Lace and free Pharloom
Passing of the Age
Hidden achievement: Grant the Herald’s wish
Completion
Achieve 100% game completion and finish the game
Speedrunner
Complete the game in under 5 hours
Speed Completion
Achieve 100% game completion and finish the game in under 30 hours
Steel Soul
Finish the game in Steel Soul mode
Steel Heart
Achieve