Regarded as Thailand's top female swimmer, she has won a total of five gold medals at the Southeast Asian Games (2003 and 2005).

[2][3][4][5] At the 2003 Southeast Asian Games in Hanoi, Vietnam, Tachakittiranan dominated the pool for Thailand by claiming a total of three gold medals in the 200, 400, and 800 m freestyle.

Swimming in heat one, she picked up a third seed by nearly two seconds behind winner Paola Duguet of Colombia in 4:23.62.

[10][11] In her second event, 200 m freestyle, Tachakittiranan ended her Olympic run with a thirty-fifth-place effort from the preliminaries.

She posted a lifetime best of 2:05.29 to lead the first heat against Chinese Taipei's Yang Chin-Kuei and Kazakhstan's Yuliya Rissik.