Across all playthroughs, discovered all possible endings
This is all going to depend on the decisions you make and who you side with throughout your playthroughs. You should be able to get this in two playthroughs. For now, that is unconfirmed. Below in the spoiler tags, is the list of what you have to do. Do not read if you don't want things spoiled for you.
- Morrigan performs the ritual that saves you.
- You sacrifice yourself to save Ferelden.
- Loghain sacrifices himself to save Ferelden.
- Alistair sacrifices himself to save Ferelden.