Yup, that's pretty much it for 100%-ing A Link to the Past.
You can also do the following, though I don't consider them requirements for 100%
-In the GBA version, there is the bonus dungeon, Palace of the Four Swords, which requires you beat Four Swords. I think there might be a way to get into it without beating Four Swords using glitches.
-Also in the GBA version, the
Riddle Quest
-There is also the secret
Chris Houlihan room you can access.