This research paper basically discussed about the empirical gaps when identifying the relationship between student engagement and their academic achievement, which would be useful for the future researches on the topic. Secondary data collection was used. A critical Literature Review was conducted using a sample size of 22 articles. The first gap is about the sample size, where the sample is being limited to just one university/school/institute. The second gap is about the way the researchers have measured the academic achievement, where most have done using a single subject result, which would be impractical. Thirdly, lack of qualitative approaches to measure the relationship between student engagement and academic achievement is identifies as a gap. As the fourth gap, students from all the years and variety of faculties should be taken, as student engagement might vary with them. As the fifth gap, many researchers have identified that most researches have been carried out targeting one country, which might be failed to give an overall result on the relationship. The sixth gap identified was that many of the researchers have paid to the respondents in filling the survey and therefore the researchers have faced restrictions due to unavailability of sufficient financial resources. The last gap which was identified throughout the literature was that information technology nowadays has an influence on student engagement and the fact was not taken into account by most of the researches. At the latter part of the research, the recommendations to the future researchers were given.