This is a big achievement for PSG and PSG is very happy with this achievement. Before this, PSG had planned everything and spent a lot of money to win only one Champions League trophy but they could not win any Champions League title and despite having many big stars in their team they failed there but this season with a solid team PSG defeated Inter Milan in the Champions League by 5-0 goals and won the Champions League title. The biggest role behind PSG's victory in this Champions League title was played by the team's manager Luis Enrique. If PSG had appointed someone else in place of Luis Enrique, PSG would never have achieved this achievement so PSG should give enough respect to the manager.
It's definitely the biggest achievement for a club that hasn't won the Champions League before to win just as it's a countries biggest achievement to win the World cup. It's true that they have been planning for this very trophy for years and in the process, they've spent billions of Euros on it on signing and paying big name players in order to win it but all to no avail back then. But right now, they've finally gotten what they've always wanted. I'm sure the kind of happiness in the heart of the owner of the club, the players will get huge bonuses for a job well done.
This is their biggest trophy ever. But i think this season they werent confident in winning the champions league. The owner himself said that they didnt expect to win it this year but yet they did. I dont know if anyone remembers but PSG barely passed the league phase in the champions league and managed to win the title and this adds a lot to their achievement this season