In March 2018, he competed in the Biathlon Junior World Championships 2017 in the Youth category and placed 2nd in the Sprint, 6th in the Pursuit, 4th in the Men's Relay and 22nd in the Individual.

[4] In the Martell-Val Martello stage of the Biathlon Junior World Cup, he placed 3rd in the Sprint and 1st in the Pursuit - winning his first international gold medal.

Following his success in the Junior field, he made his 2019–20 Biathlon IBU Cup debut on 13 February 2020 in Martell-Val Martello, in the Qualifier round for the Men's Super Sprint, where he placed 73rd.

Giacomel made his Biathlon World Cup debut just two weeks later, in Nove Mesto na Morave, where he shot clean and placed 27th - the highest ranking Italian of that day.

Later that season, in Nove Mesto na Morave, he was chosen to compete the Single Mixed Relay with Michela Carrara and placed 16th.