Shadow Gambit: The Cursed Crew

If you are going for the 70% achievement you will most likely have completed the main story, all crew tales, all captain‘s tasks and everything else in this game except collecting badges - so the way to get there is collecting more badges.
To give you an indication how many badges are needed for 70%: it unlocked for me at 368 badges (this is after the update that was released early in September 23, previously the percentage calculation was incorrect and it was easier to get to 70%).