Second language acquisition is a primary target for tertiary students in Bangladesh. The tertiary students in Bangladesh belonging to the Department of English and ELT aim to achieve English as a second language. Krashen's Affective Filter Hypothesis of the Monitor model plays an important role in second language acquisition. The hypothesis focuses on the emotional and mental attributes of the students concerned by using certain filters. These filters can either advocate for SLA or obstruct it. The author used a mixed methodology in the study. The author visited 16 universities in Bangladesh to collect the primary data from 160 participants belonging to the Department of English. The secondary data has been collected from relevant existing studies. Questionnaires were provided for the collection of data from the participants. The participants were divided into focus groups for the discussion on the open-ended questions. It exposes the teaching methodology, pedagogical standards, and the curriculum too. The contents in the graduate and postgraduate studies are based on various branches of applied linguistics and genres of English literature as a part of the curriculum and OBE. The filters based on emotional and mental mindset get activated during the study of these texts, and the acquisition of language takes place accordingly. The study has shown that positive filters facilitate second language acquisition, whereas negative filters discourage second language acquisition, as these discourage understanding the comprehensible input. The study has shown that most of the students claimed that the positive filters trigger second language acquisition in the EFL classrooms by using the LAD effectively. The educators can use the filters to create favorable conditions that ensure sustainable second language acquisition, which in turn promotes the socio-economic development of students by enhancing their employability in diverse professional cultures.