I've stolen Jude's (Lightfellower) idea because I thought it was interesting to examine. I'm ever so slightly ahead of him with 58 total completed RPG's.
Sega Master System (2)
Miracle Warriors
Phantasy Star
Sega Genesis (7)
Phantasy Star II
Phantasy Star III: Generations of Doom
Phantasy Star IV
Shining Force
Shining Force 2
Shining in the Darkness
Starflight
Playstation (2)
Suikoden
Suikoden 2
Gameboy Advance (2)
Fire Emblem
Fire Emblem: Sacred Stones
Gamecube (1)
Baldur's Gate: Dark Alliance
Playstation 2 (24)
Ar Tonelico: Melody of Elemia
Arc the Lad: Twilight of the Spirits
Champions of Norrath
Disgaea 2: Cursed Memories
Disgaea: Hour of Darkness
Final Fantasy X
Final Fantasy X-2
Gladius
La Pucelle: Tactics
Persona 3
Radiata Stories
Rogue Galaxy
Shadow Hearts
Shadow Hearts: Covenant
Shadow Hearts: From the New World
Shin Megami Tensei: Nocturne
Shining Force Neo
Suikoden III
Suikoden IV
Suikoden Tactics
Suikoden V
Xenosaga Episode 1: Der Willie Zur Macht
Xenosaga Episode 2: Jenseits von Gut und Bose
Xenosaga Episode 3: Also Sprach Zarathustra
Xbox (1)
Jade Empire
X360 (
Enchanted Arms
Eternal Sonata
Fable 2
Fallout 3
Infinite Undiscovery
Lost Odyssey
Mass Effect
Tales of Vesperia
PC (12)
Al-Qadim: The Genie's Curse
Arcanum: Of Steamworks and Magick Obscura
Baldur's Gate 2: Shadows of Amn
Diablo
Diablo II
Icewind Dale
Knights of the Old Republic
Knights of the Old Republic 2
Lands of Lore: The Throne of Chaos
Might and Magic IV: Clouds of Xeen
Might and Magic V: The Darkside of Xeen
Planescape: Torment
Star Control 2
Soon to join the list: The Last Remnant, Persona 3 FES, Growlanser II, Vampire the Masquerade: Bloodlines.