The challenge I have been doing for the last few years is something actually inspired by an old challenge thread I originally saw on here but unfortunately there didn't seem to be any discussion of it at all on fm22
The Gibraltar Challenge
Using the official SI Gibraltar League expansion the (lofty) goal of this challenge is to win the world cup with minnows Gibraltar
Those familiar with the San Marino challenge will recognise the mechanics - Start as EITHER a club team manager in Gibraltar and eventually get the international job too or start as both club and country manager from the off, and develop the clubs facilities to a point where they can produce a generation of players capable of competing at the biggest stage of them all (using income mainly from European competition to do so)
For an added challenge I prefer to start as any club other than the only two professional clubs on the rock, so you have the early game challenge of trying to dislodge them starting with a team of amateurs - turning your attention to European and then International football when you have achieved domestic domination
I must confess I have never even come close to achieving this one, with a late heartbreak in European Championship qualifiers losing our spot in the tournament on the last matchday being as far as I have got without quitting a save but it doesn't stop me trying every year. I have seen people on here do it by the mid 2040s though