So glad I found this thread- the story mode advice was so helpful. I went from only 2 dodge credits across like 6 public events to finishing this in one go with story mode. To answer the question on how to get to this story for achieves since it isn’t a purple star on the map like other story replays- you just need to talk to Brek in EOTN same as when you enter the public story. If you have the champions story episode on, he has the option to enter story mode for achievements.