In March 2016 Achampong competed at the British Team Championships where she placed eleventh in the all-around but recorded the third highest balance beam score and helped her team finish fifth. In April 2017 she competed at the English Championships where she only competed on uneven bars, balance beam, and floor exercise and recorded the second highest scores on uneven bars and balance beam. In December she competed at the British Espoir Championships where she placed first in the all-around, on balance beam, and on floor exercise, and placed second on uneven bars.
Junior
2018
In February Achampong competed at the English Championships where she placed second behind Amelie Morgan. The following month she competed at the British Championships where she placed third in the all-around behind Morgan and Annie Young. During event finals she placed third on uneven bars and floor exercise and sixth on balance beam. In April Achampong competed at the 2018 City of Jesolo Trophy where she placed fifteenth in the all-around and helped Great Britain finish fourth in the team competition. In July she competed at a friendly competition in Pieve di Soligo where she placed eleventh in the all-around but helped Great Britain win the bronze in the team competition. In August Achampong represented Great Britain at the European Championships alongside Morgan, Young, Halle Hilton, and Phoebe Jakubczyk. Together they won the bronze medal in the team competition behind Italy and Russia. Individually Achampong finished tenth in the all-around. Achampong ended the season at the Top Gym Tournament where she won gold on balance beam and placed fourth in the all-around and on floor exercise.
2019
In February Achampong competed as a guest at the Welsh Championships where she placed first in the all-around and recorded the highest score on each apparatus. In March she competed at the English Championships where she placed first in the all-around ahead of Halle Hilton and Jennifer Gadirova. Later that month she competed at the British Championships where she placed first in the all-around and also won gold on uneven bars and balance beam and placed fourth on vault. In July Achampong competed at the Sainté Gym Cup where she helped Great Britain win team gold and individually she placed first in the all-around. Later that month she competed at the European Youth Summer Olympic Festival alongside Hilton and Young. Together they won bronze in the team competition behind Russia and Romania. Individually Achampong won silver in the all-around behind reigning junior world championViktoria Listunova of Russia. During event finals she won gold on balance beam ahead of Silviana Sfiringu of Romania.
Senior
2020
In 2020 Achampong became a senior. She made her senior debut at the Melbourne World Cup where she qualified to the balance beam and floor exercise finals. During event finals she won silver on balance beam behind Urara Ashikawa of Japan and placed fourth on floor exercise behind American Jade Carey and Italians Vanessa Ferrari and Lara Mori. She later competed at the Baku World Cup; during qualifications she once again qualified to the balance beam and floor exercise event finals. However event finals were canceled due to the COVID-19 pandemic in Azerbaijan. In June Achampong announced that she had verbally committed to the University of California, Berkeley to compete for their gymnastics program.
