All of them, but only like...I played only one version of each (except for GAA and AAI which I played on DS and the official English release on PC
I am also probably the only one that ""played"" Gyakuten Saiban Jiten, which is not actually a game but rather a "encyclopedia" so you don't actually "beat it" (you can get 100% to unlock everything but...it still doesn't count as a game)
Phoenix Wright: Ace Attorney (DS)
Justice for All (DS)
Trials & Tribulations (DS)
Apollo Justice: Ace Attorney (DS)
Dual Destinies (3DS)
Spirit of Justice (3DS)
Ace Attorney Investigations (DS)
Ace Attorney Investigations (PC)
Ace Attorney Investigations 2 (DS)
Ace Attorney Investigations 2 (PC)
Great Ace Attorney: Adventures (DS)
Great Ace Attorney: Adventures (PC)
Great Ace Attorney: Resolve (PC)
Professor Layton vs. Phoenix Wright: Ace Attorney (3DS)