Rubuta ci gaba don wannan sakin layi - Tachakittiranan ta fara shiga tawagar Thai, a matsayin matashi mai shekaru 17, a Wasannin Olympics na 2000 a Sydney. A can, ta kasa ci gaba zuwa zagaye na gaba a kowane ɗayan wasanninta, ta gama na arba'in da biyar a tseren mita 50
(27.31), na talatin a cikin 200 m freestyle (2:05.88), da kuma talatin da tara a cikin 100 m freestyle (58.69) da kuma 400 m freestyle (4:29.28).