The study aimed to identify the factors and to demonstrate their effects on academic achievement in various publications that utilized meta-analyses. For this purpose, the meta-analyses publications on the Web of Science-All Database till 2018 were reviewed. In the study, the systematic review method was adopted. Following a related review, 169 meta-analyses were included in the scope of the study. The effects of 254 variables on academic achievement were investigated, and consequently, 427 effect sizes were found in total. Variables obtained from meta-analyses with the effect sizes between -0.799 and 3.170 were examined in nine categories. The results revealed that the number of variables evaluated in the categories of psychological, socio-economic, socio-demographic and individual characteristics, learning theories and teaching strategies, and family was bigger than other categories.