This study examines the relationships among students' perceptions of autonomy, competence, and relatedness, self-determined motivation, and achievement across two different undergraduate Calculus learning environments at the same institution. Furthermore, it also exposits how learning environments are not culturally or socially neutral by establishing clear evidence that one learning environment offered motivational support and associated achievement gains to specific demographic groups while diminishing motivation and achievement for others. To accomplish this, we applied constructs from Self-Determination Theory (SDT) within a quasi-experimental design (N = 6866),