There isn't any journal system in game.
Side quests though, they don't throw many at you that requires you to have a long list unless you're constantly putting them off and the help centers you can always go there and they offten tell you where to go. When it comes to the MC I've got nothing they are more our eyes and ears as players then someone like Aelita or Ren who have defined characters so I wouldn't see a point in Jan implimenting one but eh could be wrong for what he chooses to add to his game.