I want a team shared Adventure Journal. But there’s no need to redo everything (wings npcs, rankings, etc), a change to Adventure Journal would mess too much stuff so I suggest a SECOND ADVENTURE JOURNAL.
It’s simple, we get a second Adventure Journal and Ranking where we can track our progress as a team. Same features, no rewards, just a nice way to allows us to ‘complete’ the game using all our characters.
It’s not hard. Each update to character Journal updates the team Journal and that’s it, nothing to unlock, no rewards.
About Achievements, make them team shared like Collections. Killing millions of enemies two, three times is too much and the rewards (titles, hair colors) are just esthetic effects, cool to show off but not worth hundreds of hours to unlock multiple times.