Motivation is one of the key factors driving language learning success. Without student motivation, there is no pulse; there is no life in the class. This paper is an attempt to look at what motivates the students of Dili Institute of Technology (DIT) to learn English and the relationship between students' motivation and their English achievement. In particular, investigates whether the students are driven by intrinsic or extrinsic motivation, and the impact of the motivation on students' achievement. The method used in this research is questionnaires to elicit information about factors which contribute to students' motivation in learning English. The sample is 80 students from the first term of the 2017 academic year. The results show that the majority of DIT students have good motivation to learn English. They are driven by both intrinsic motivation and extrinsic motivation, but intrinsic motivation is higher than extrinsic motivation. Their claimed motivation is reflected in their practical initiatives to achieve their goals in learning English through a number of productive and receptive learning activities done outside of class.