Academic stress has emerged as a substantial issue among college students because to escalating academic pressures, competitive atmospheres, and concerns about future careers. Moderate stress may enhance student performance; Having said that, mental health and academic performance are both negatively affected by extreme stress. Kids can't handle schoolwork, keep their emotions in check, or succeed academically if they aren't mentally healthy. The relationship between college students' academic achievement, mental health, and academic stress is the focus of this study. Employing a quantitative research methodology, data are collected from undergraduate and postgraduate students through a structured questionnaire. Academic stress is assessed through workload, examination pressure, time management difficulties, and academic expectations, whereas mental well-being is measured through emotional stability, psychological well-being, and stress management. Academic achievement is evaluated through GPA, academic performance, and learning satisfaction. Descriptive statistics, regression, correlation, and mediation analyses are among the statistical methods used. In contrast to the positive relationship between mental health and academic achievement, the findings of this study are expected to show that academic stress has a negative effect on both. The research offers significant insights for educational institutions, counsellors, and policymakers aiming to improve student well-being and academic achievement.