Traditional Human Resource Management (HRM) focusing on maintaining the status quo is no longer in the spotlight. Sustainable HRM has become the new approach, emphasizing the need to attend to organizational results directed toward reaching different goals and integrating the needs of diverse stakeholders. Moreover, in response to the challenges that organizations face in volatile, uncertain, complex, and ambiguous (VUCA) environments, Human Resource (HR) practices can contribute to the development of idiosyncratic deals (negotiation of individual HR practices) that might facilitate employees’ creativity and eudaimonic well-being in the long term and, thus, the sustainability of these organizations. Thus, the aim of this study is to test the mediating role of idiosyncratic deals (i-deals) in the unfolding relationship between HR practices, eudaimonic well-being and creative performance. Using a longitudinal database (three waves), the hypotheses are tested using structural equations modeling. The results support the idea that HR practices function as an antecedent for i-deals. More specifically, i-deals fully mediate the relationship between HR practices and eudaimonic well-being. In turn, i-deals and eudaimonic well-being fully mediate the relationship between HR practices and creative performance, which suggests that, through i-deals, HR practices become more beneficial for both employees and employers. In conclusion, these results are important for sustainable HR development, because HR practices enhance i-deals, which increase well-being, enhancing performance in the long term.