If we include game series I've played all of but not beaten there are a few more:

I have played every main line FF game except for XI. Haven't beaten them all. Usually stopped around the last boss fight.

I have played every Star Ocean game except the new one coming out BUT I only played the first vvverrrryy briefly and didn't beat most of them

Played all three Agarest War main games, didn't beat them

Played every gen of Pokemon, got much further in some than others

Played all of the Spyro games up to 4. Heard there are more after that but I pretend that's a myth

I have tried all of the Scribblenauts games, I think, but some I have barely played


Oh also I remembered that I beat both Style Savvy games