This study aims to analyze the effect of the work environment and organizational culture on employee performance through the mediation of achievement motivation. The research population consists of 64 permanent employees working in the Bureau of Personnel and Organizations, using the Structural Equation Model-Partial Least Square with SmartPLS 3.2.9. The result of this study found that the work environment has a direct and significant positive effect on employee performance and achievement motivation; organizational culture has a positive but not significant effect on employee performance; organizational culture has a positive and significant effect on achievement motivation; achievement motivation has a positive and significant effect on employee performance; work environment mediated by achievement motivation has a positive but not significant effect on employee performance; organizational culture by mediating achievement motivation has a positive and significant effect on employee performance. Organizational leaders are suggested to improve a conducive office atmosphere and create harmonious relationships among employees so that employee performance increases.

Keywords : Work Environment, Organization Culture, Achievement Motivation, Employee Performance.