Ummm... why does your guide say that playing Fable: The Journey is "unnecessary" to unlock Gabriel and Theresa? You mention no other way of obtaining them, and I have not read anywhere else online that this is even possible. Surprised no one else noticed this.
Completed + all DLC: 24 | Banjo-Kazooie, Banjo-Kazooie N&B, Banjo-Tooie, Dash of Destruction, Fable II, Fable III, Halo 3, ODST, Halo Reach, Harm's Way, Hydrophobia, Monopoly Streets, Silent Hill Homecoming, Sonic's UGC, Sonic Adventure, Sonic & Knux, Sonic & Sega ASR, Sonic 1, Sonic 2, Sonic 3, Sonic 4 Ep. 1, South Park, Ult. MK3, WWE All Stars
Completed (minus DLC): 3 | Dark Void, Resident Evil 5, Force Unleashed