[2] Goodfellow won a bronze medal in the Men's 10m Synchronised Platform event with his diving partner Tom Daley at the 2016 Summer Olympics in Rio de Janeiro.

In 2022 he won his first major title as a solo diver, winning gold in the men's 3 metre springboard at the 2022 Commonwealth Games.

He won gold medals in 10m platform as well as 3m and 1m springboard in the 10 to 11-year-old category of the 2007 ASA National Age Group Championships as well as a bronze in the synchro.

[11] In 2011, at the age of 14, Goodfellow won his first medal in a major competition at the European Junior Diving Championships in Belgrade, winning bronze in the 3m springboard.

[15] Goodfellow and Daley earned a place in the 10m platform synchro competition at the 2016 Olympics in Rio de Janeiro by winning the bronze medal at the FINA Diving World Cup on 21 February 2016.

[16] They produced the single best synchro 10m diving score, achieving it with a forward four-and-a-half somersault (109C), with a difficulty of 3.7, which was awarded 91.02 points.

[19] Goodfellow and Daley earned a bronze medal in the 2016 Olympic 10m synchro competition in Rio on 8 August primarily by scoring 92.13 on their fifth dive, which was a 109C with a 3.7 degree of difficulty.

[24] At the 2021 FINA Diving World Cup held in Japan as an official test event for the 2020 Tokyo Olympics, Goodfellow won gold in synchronised 3m springboard with Laugher.

Praising his fellow divers and coaches, he described how “fortunate and privileged” he felt to have “been part of an era of British diving that has seen so much success and growth”.