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