... and which ones did you beat?
~I hope that this is the right place for this. If not, someone please move it.~
Well, lets start with PS1:
Final Fantasy Anthology (IV + V)
Final Fantasy Origins (I + II)
Final Fantasy VI
Final Fantasy VII 
Final Fantasy VIII
Final Fantasy IX
PS2:
Dirge of Cerberus - Final Fantasy VII
Final Fantasy X
Final Fantasy X-2
Final Fantasy XII
Nintendo DS:
Final Fantasy III
Final Fantasy XII - Revenant Wings
The games written in green are the games I've beaten so far.