Achievement goal theory is one of the most widespread motivation models within education research. Strong empirical support exists for the trichotomous model, comprising mastery-approach, performance-approach, and performance-avoidance goals. However, research also indicates problems with model transferability between contexts. In this study, based on questionnaire data from 4201 students, we use confirmatory factor analysis to compare the factor structures of students' achievement goals in two culturally distinct countries. Factor structures for Grades 5-11 within the two countries were also compared. Results show that the separation between performance-approach and performance-avoidance goals differs between the two countries, and that this difference is consistent over the grades. Hence, results indicate that the model is not freely transferable between countries. The results are discussed in relation to differences in national culture and other proposed explanations such as age, perceived competence, and questionnaire characteristics.