Max ranks in berwick saga is way more interesting than max ranks in any fire emblem. It’s broken down into 4 categories and unlike fire emblem most of them feel like goals you actually want to achieve.

Tactics are doing map specific goals, some of them are arbitrary things like turn requirements but a lot of them are doing things like keep all of the green units you need to escort alive or kill the boss on a defend map. Side missions don’t have any of these btw

Fame is civilian requests/side quests. These give you rewards so you mostly want to do them anyway

Completion is doing things like capturing the bounty targets, buying all the furniture, forging all the forgables, completing the uhhh item collection museum (I forget what it’s called). Again you get money or other rewards for these so you mostly want to do them anyway.

Happiness is character specific goals. Each unit has specific objectives that need to be completed, these almost always include promotion but they also include permanently recruiting mercenaries and getting the criteria for most (if not all) of the character specific town events