This paper investigates the relationship between educational achievement and the motivation to learn. We used the 2006 Programme for International Student Assessment (PISA) that contains representative samples from 55 nations. A strong negative correlation between educational achievement and motivation toward science learning emerged at the national level. We found that differences in the socioeconomic levels of nations are associated with this unexpected negative correlation. Children from developed societies achieve higher educational results but may tend to be rather critical in describing their learning motivation, and vice versa, students from developing countries do not attain very high educational outcomes, but their motivation, as stated on the self-report questionnaires, is high. We offer different explanations for this phenomenon. The motivation to learn in relation to the level of development of countries is a moving target, and this should be taken into account at all levels of education policymaking, from schools to national governments.