Although the emotion authentic pride has been posited to promote achievement, it remains unclear precisely how this works. Here, we tested whether authentic pride promotes adaptive downstream achievement outcomes by motivating individuals to engage in appropriate behavioral responses to success and failure. In two longitudinal studies (N = 1,132), we measured pride emotional responses to a prior performance and subsequent changes in achievement‐oriented behavior and performance outcomes among (a) adults training for long‐distance running races and (b) undergraduates completing class exams. Authentic pride shifted in direct response to achievement outcomes, such that those who performed well felt greater pride. Furthermore, individuals who felt low authentic pride responded to these feelings by changing their achievement behavior in a functional manner. In Studies 2a, 2b, and 2c, we found that pride‐driven behavioral changes led to improved future performance among low performers. In these studies we also demonstrated that the effect of authentic pride on achievement is independent of that of self‐efficacy, which in fact works in an opposite manner. Taken together, these results suggest that authentic pride functions as a barometer of achievement, promoting behavioral responses that lead to improved performance.