The 19-year-old, who was born in the United States but has a British father, has taken bronze in the women’s ski slopestyle.
Atkin scored 84.60 on a strong final run to win the first British Winter Olympic medal on skis.
Sarah Hoefflin of Switzerland won gold with a score of 91.20 while compatriot Mathilde Gremaud took silver.
Atkin said: “I’m just relieved. I’m really happy. I’m really excited and overwhelmed.
“There were tons of big names in the field, it could have been anyone’s medal.
“I knew I’d skied the best I could and I was just waiting for the last girls to drop. My heart was racing and I couldn’t believe it.
“I’m speechless and stoked to win the bronze.”
Fellow Brit Katie Summerhayes finished seventh in the final as she battled through the pain barrier.
A disappointed Summerhayes said: “I hurt my ankle in training and I wasn’t really able to walk on it so I tried to put everything out there.
“It was the same result as four years ago and I’ve just worked so hard. It doesn’t feel good right now.
“I’m gutted. I’ve worked so hard for the last four years and got injured two months ago. It’s going to hurt for a while I think.”
Atkin’s medal comes a day after Dom Parsons won bronze in the men’s skeleton.