Learning analytics has received increasing attention in the field of education. However, few studies have investigated the overall impact of learning analytics interventions on learning achievements. This study aims to close this research gap and examine the sizes of the overall effects of learning analytics interventions on learning achievements according to research conducted from 2012 to 2021. In total, 33 empirical studies including 3098 participants were synthesized in the present meta-analysis. The findings revealed that learning analytics interventions had a large effect size on learning achievements. Furthermore, the impacts of 13 moderator variables were analyzed in depth. The results indicated that sample levels, learning domains, learning approaches, learning analytics technologies, and learning analytics metrics significantly moderated the effectiveness of learning analytics interventions. These findings and their implications for the use of learning analytics interventions were discussed in depth.