Here are the level titles from 1st Edition AD&D for the classes in the
Players Handbook and
Unearthed Arcana. Barbarians don't have level titles.
Cavalier:
[The first two titles are for 0-level grades that character not of Upper Class need to go through]
Horseman
Lancer
Armiger
Scutifer
Esquire
Knight Errant
Knight Bachelor
Knight
Grand Knight
Banneret
Chevalier
Cavalier
Paladin:
Gallant
Keeper
Protector
Defender
Warder
Guardian
Chevalier
Justiciar
Paladin
Cleric:
[The 5th level title was misspelled as "Perfect" in early printings, later it was removed instead of being corrected]
Acolyte
Adept
Priest
Curate
Prefect
Canon
Lama
Patriarch
High Priest
Druid:
Aspirant
Ovate
Initiate of the 1st Circle
Initiate of the 2nd Circle
Initiate of the 3rd Circle
Initiate of the 4th Circle
Initiate of the 5th Circle
Initiate of the 6th Circle
Initiate of the 7th Circle
Initiate of the 8th Circle
Initiate of the 9th Circle
Druid
Archdruid
The Great Druid
The Grand Druid
Hierophant Druid
Hierophant Initiate
Hierophant Adept
Hierophant Master
Numinous Hierophant
Mystic Hierophant
Arcane Hierophant
Hierophant of the Cabal
Fighter:
Veteran
Warrior
Swordsman
Hero
Swashbuckler
Myrmidon
Champion
Superhero
Lord
Ranger:
Runner
Strider
Scout
Courser
Tracker
Guide
Pathfinder
Ranger
Ranger Knight
Ranger Lord
Magic-User:
Prestidigitator
Evoker
Conjurer
Theurgist
Thaumaturgist
Magician
Enchanter
Warlock
Sorcerer
Necromancer
Wizard
Mage (At 16th Level)
Arch-Mage (At 18th Level)
Illusionist:
Prestidigitator
Minor Trickster
Trickster
Cabalist
Visionist
Phantasmist
Apparitionist
Spellbinder
Illusionist
Thief:
Rogue (Apprentice)
Footpad
Cutpurse
Robber
Burglar
Filcher
Sharper
Magsman
Thief
Master Thief
Thief-Acrobat:
[Class begins at 6th level]
Burglar-Acrobat
Second-Story Thief
Cat Burglar
Master Cat Burglar
Thief-Acrobat
Master Thief-Acrobat
Assassin:
Bravo (Apprentice)
Rutterkin
Waghalter
Murderer
Thug
Killer
Cutthroat
Executioner
Assassin
Expert Assassin
Senior Assassin
Chief Assassin
Prime Assassin
Guildmaster Assassin
Grandfather of Assassins
Monk:
Novice
Initiate
Brother
Disciple
Immaculate
Master
Superior Master
Master of Dragons
Master of the North Wind
Master of the West Wind
Master of the South Wind
Master of the Est Wind
Master of Winter
Master of Autumn
Master of Summer
Master of Spring
Grand Master of Flowers
Bard:
Rhymer
Lyrist
Sonnateer
Skald
Racaraide
Joungleur
Troubadour
Minstrel
Muse
Lorist
Bard
Master Bard