This is story-related and should be unlocked when:
This achievement did not unlock for me during my first play through on Xbox One. If this happens to you, here is what I did:
1. Exit to the main menu after the last save point
2. Select play
3. Select Continue Episode
4. Chose Y to rewind
5. Chose Point 6
6. Replay the sequence
Point 6 picks up just before the visitor arrives to Ironrath. You will likely have replay 30 or so minutes to complete the final chapter of the game.
For what it's worth, I chose a different decision in the Small Council meeting (Point 5) on how to greet the visitor:
*** Spoiler - click to reveal ***During my first play through I chose diplomacy and greeted Ramsay in the great hall. During my second play through, when the achievement unlocked, I greeted Ramsay at the gate and offered ironwood as a gift to his father.
I played through two choices to make sure the achievement would unlock. I can't say if changing the decision matters to unlock the achievement, though I wanted to share what I did when I finally got it unlocked.
Good luck!