Stacchiotti also holds numerous meet records and collects a total of 49 medals (40 golds, seven silvers, and two bronzes) from the Games of the Small States of Europe (2007, 2009, 2011, 2013, 2015, 2017 and 2019).

At the 2008 Summer Olympics, Stacchiotti became the youngest athlete (aged 16) to be chosen by the Luxembourg squad, and was given the honor of carrying the nation's flag in the opening ceremony.

Stacchiotti made his official debut, as Luxembourg's youngest athlete in history (aged 16) at the 2008 Summer Olympics in Beijing, where he was given the honour of carrying the nation's flag in the opening ceremony.

[9][10][11] At the 2010 European Junior Swimming Championships in Helsinki, Finland, Stacchiotti stormed home on the final lap to defend his 200 m individual medley title in 2:02.52, holding off Great Britain's Ieuan Lloyd by two-tenths of a second (0.20).

[19] Four days later, in the 200 m individual medley, Stacchiotti registered a time of 2:00.38, just a small fraction outside his own record, but missed the semifinals by a tenth of a second (0.10) behind Canada's Andrew Ford.