On my best save:

1. Barret, Cloud, Tifa, Cid, and Vincent are on level 99.
2. I have four gold chocobos.
3. Cloud, Tifa, Barret have their ultimate weapons.
4. ALMOST all of my materia are mastered.
5. A lot of gil and GP.
6. I beat all of the WEAPONs.
7. All of my characters (excluding Cait Sith) know their ultimate Limit Break.
8. And all summons (even Alexander, which I had missed numerous times before in my previous games)

And that's all I can remember