Here is the full list of all 100 Doodle Harmony Ghosts achievements.
Match Doom
Match Spirit
Match Ghostlight
Match Vespera
Match Phantomessence
Match Phantomine
Match Evernight
Match Banshee
Match Mystery
Match Spector
Match Twilight
Match Ectoplasm
Match Solstice
Match Mist
Match Soul
Match Shroud
Match Poltergeist
Match Glimmer
Match Flicker
Match Nebula
Match Orion
Match Apparition
Match Eclipse
Match Phantasm
Match Astraeus
Match Spook
Match Lunara
Match Astraea
Match Luna
Match Dreamer
Match Shadey
Match Esprit
Match Shadow
Match Zephyr
Match Eclipsa
Match Eerie
Match Ephemera
Match Echoa
Match Specter
Match Phantasia
Match Nightshade
Match Ethos
Match Enigma
Match Celestia
Match Lumina
Match Midnight
Match Shade
Match Revenant
Match Embera
Match Radiance
Match Lunaire
Match Phantomess
Match Wisp
Match Wraithling
Match Whimsy
Match Ethereal
Match Aurora
Match Haze
Match Lysandra
Match Mystic
Match Dusk
Match Moondust
Match Ghostly
Match Phantomina
Match Whisper
Match Nyx
Match Cosmos
Match Phantom
Match Ember
Match Echo
Match Solara
Match Phantomita
Match Whisperer
Match Umbra
Match Phantomise
Match Astral
Match Seraph
Match Spookette
Match Mysticara
Match Nocturne
Match Dread
Match Nova
Match Wraith
Match Phantomize
Match Mirage
Match Veil
Match Nox
Match Etherealyn
Match Lucida
Match Stardust
Match Spiritus
Match Nexus
Match Shadowcaster
Match Vortex
Match Illume
Match Haunt
Match Raven
Match Ghoul
Match Nighthaven