So when it comes to the main quest I've found:

4 Ways to get inside the Fort.
1) Shrine hidden door.
2) Solo Partner.
3) Through fire slug Cave.
4) Through the main gate, getting past guards or murdering them.

4 Ways to escape the Fort.
1) Boat.
2) Sewers.
3) Main bridge.
4) Docks.

2 Ways to remove the collar.
1) Become the one.
2) Seeker camp.

3 Ways to handle the shriekers.
1) Get wand from the Witch.
2) Get the wand from the treasury.
3) Free the Dragon.


I'm pretty sure there are no more choices, but I might be mistaken. So what have you found?