Published 17/03/2019 at 11:50 GMT | Updated 17/03/2019 at 13:52 GMT
American superstar Shiffrin had already won the overall World Cup title as well as the slalom and Super G crowns for 2018-19 – and adding the giant slalom saw her level the achievements of Lindsey Vonn (2010 and 2012) and Tina Maze (2013).
"I wanted to really, really earn it and deserve it. I'm really happy with my skiing and the whole day.
Shiffrin: I wanted to really, really earn it
"I had energy. I was able to compete with focus. It's amazing."
Shiffrin already held a dominant lead in the standings and knew she only had to finish in the top 15 in Andorra – with rival Petra Vlhova needing to win and for Shiffrin’s challenge to collapse.
'The day belongs to her again!' - See how Shiffrin claimed giant slalom title
In the event she won the race by three tenths of a second, with New Zealand youngster Alice Robinson coming second and Vlhova in third. Robinson, still just 17, held the lead until Shiffrin took to the slopes for the final World Cup run of the entire season.
Fittingly, it resulted in Shiffrin's 17th win of the season and 61st overall.
Shiffrin breaks down in tears as she finally lifts giant slalom Crystal Globe