Well, I mostly play VS mode, so I never got too far in the game afte unlocking everything.(exept for the tropheys). So, my lates achievment was completing classic in medium mode with everyone, and in hard mode with peach.
Next, I will get normal in adventure with everyone, then normal in all-star.
Afterwards, I will try to beat them all on hard mode.
Oh, and my lil cousin erased all of my data a while back, And i'm sure I had a lot of stuff beaten. *sigh*