Maybe not overachievement but on an old save I had, Utd won 12 straight league titles and 8 champions league in those 12 years, made every semi final. Januzaj won most of the World Player of the year awards and Wilson reached 300 league goals
On my Newcastle save, I was able to smash Man United 6-1 in my first season. Papiss Cisse got top scorer that season despite missing 7-10 games due to being 3rd choice to being with and the injury he had at the start of the game. Cisse scored 5 goals that game.
Around 8-9 years into this save, I have now overtaken Alex Ferguson as the best manager of all time.