Endings (Hollow Knight)

Ending 1: The Hollow Knight
Requirements: Upon defeat, the Hollow Knight dies and The Knight absorbs the infection into themself. The Knight is then sealed inside the Black Egg and the game ends.
 * Not having acquired Void Heart
 * Defeating the Hollow Knight

Unlocks the "The Hollow Knight" achievement.

Also unlocks the Infected menu style.

Ending 2: Sealed Siblings
Requirements: Near the end of the fight, Hornet will swoop in and fracture the Hollow Knight's mask with her needle before restraining it and giving The Knight an opening.
 * Having acquired Void Heart
 * Defeating The Hollow Knight

If the player strikes the boss enough times while it is restrained or the player takes too much time to use the Dream Nail on the Hollow Knight, it breaks free, knocking Hornet unconscious, and the fight continues. This triggers an ending where, in addition to the events of the first ending, Hornet is also sealed inside, her mask appearing on the door (similar to how the Dreamers' masks appeared before).

Unlocks the "Sealed Siblings" achievement.

Also unlocks the Infected menu style.

Ending 3: Dream No More
Requirements: While Hornet has the Hollow Knight pinned down, if the player uses the Awakened Dream Nail on them, they will be transported inside Hollow Knight's mind to challenge The Radiance. At the end of this fight, the Hollow Knight returns as a Shade that rips open the Radiance's face, allowing the Knight to lash at her until she is eventually dragged into the Void and banished.
 * Having acquired Void Heart
 * Defeating The Radiance

After The Radiance is defeated, the Infection is purged and the Black Egg vanishes from the temple. Hornet wakes up to find the Knight's mask broken in half at the centre of a crater in the room, implying the Knight has either died or returned to the Void.

The scene changes to a shot of The Abyss where we see the Siblings sink down into the ground, their spirits put to rest with the end of The Radiance.

Unlocks the "Dream No More" achievement.

Also unlocks the Void menu style.

Ending 4: Embrace the Void
Requirements: The player first needs to unlock the Pantheon of Hallownest by conquering all pantheons before it. After fighting through all of the Pantheon the player is met with the final boss: Absolute Radiance.
 * Beating all Pantheons
 * Defeating Absolute Radiance

Upon Absolute Radiance's defeat the Knight's shell splits open and its Shade falls into the roiling mass of void below. Soon after the screen flashes and suddenly the God of Gods appears in the Knight's place. After prying open Absolute Radiance's face the God of Gods then proceeds to slash and rip at her until she eventually explodes into Essence.

Afterwards Void starts to rain down from the skies inside Godhome and we are faced with The Godseeker, staring up in shock and fear as the inky substance leaks out from above the clouds. The God of Gods suddenly shoots downwards towards the main atrium of Godhome and on its passing a couple of Void tentacles reach out and wrap up Godseeker leaving her fate decided. Then the scene cuts to the physical body of The Godseeker still in the Junk Pit crying Void as their body starts to pulsate and seep out even more of the black substance. Shortly after black tentacles burst out of their body and start lashing about.

The scene shifts again to inside the Temple of the Black Egg where Hornet stares perplexed at the shriveling vines of The Infection. A figure dragging chains suddenly lurches out which causes Hornet to ready her guard. This figure, although unspecified, is believed to be The Hollow Knight; now free from its duty to contain The Radiance.

Unlocks the "Embrace the Void" achievement.

Ending 5: Delicate Flower
Requirements: The events that play out prior are the exact same as Embrace the Void. However, just as the Void tentacles start to burst out from Godseeker a drop of Void lands on the Delicate Flower which is being held by the dying bug. In a brilliant white flash the Godseeker and the void disappear leaving only the flower upon the ground with a tinge of black on one of it's petals.
 * Beating all Pantheons
 * Defeating Absolute Radiance
 * Having given the Delicate Flower to The Godseeker

The scene follows in the same as Embrace the Void with Hornet in the Temple of the Black Egg.

Extra Ending: Passing of the Age
After any other ending, if the player has completed Mister Mushroom's quest by talking to him in all areas in a certain order, a cutscene will play after the main cutscene depicting Mister Mushroom flying off into the sky.

Unlocks the "Passing of the Age" achievement.

Trivia

 * After any ending, loading the save file again will bring the Knight back to the Bench inside the Temple of the Black Egg, while recording the defeated Bosses in the Hunter's Journal. (This does not apply to Godmaster endings.)
 * This means that if the player acquires the Void Heart prior to reaching the end of the game, they will no longer be able to unlock the first ending from that save file.
 * For the new Godmaster endings giving the Delicate Flower to The Godseeker will lock the player out of the normal Embrace the Void ending although there is little reason to achieve the first ending other than to compare differences.

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