#1 Qualifying for the Champions League by winning the Europa League
All of the top six clubs in the Premier League fight for those coveted Champions League spots, and unfortunately two of them have to miss out. In Jose Mourinho's first season in charge, the ultimate goal was to qualify for the UCL either through the Premier League top 4, or by winning the Europa League.
Relying on just winning the Europa League is always a risky proposition, but Jose Mourinho had no other choice in the second half of the season. The Portuguese knew that he could not finish in the top four, and so used most of his best resources in the European competition. Henrikh Mkhitaryan was the star performer for the Red Devils throughout the UEL campaign, and even scored a goal in the final against Ajax.
It was also the first time in 8 years United had won an European competition. Though its value is nowhere near the Champions League, still it meant a lot to the fans who are accustomed to seeing their team win trophies season after season.