This study is aimed at analyzing the factors influencing the achievements of students in the subject of Islamic Studies for Form 5 SPM (KBSM) in schools in the area of Samarahan, Sarawak. The factors analysed is attitude and interest. This is a survey based study and data was compiled from the survey forms which had the topic "Factors influencing Students' Achievement", which consisted of 26 items and 1 set of questions with 40 items to measure the achievements of students, which was comprised of 200 Form 5 students from five (5) schools in the district of Samarahan. Five students involved as interviews' respondents in this study. Interview technique was also utilised to analyse and clarify the issues under study. Data analysis were performed using software Statistical Packages For Social Science (SPSS) involving frequency, percentage, mean and standard deviation. The research found that interested did not have significant relationship with the achievement of the students while the attitude factor has a significant relationship with the students' achievement in the subject of Islamic study.