This systematic review of literature on foreign language anxiety and its relationship with achievement is additional clarification to the earlier works and reviews concerned with this issue. Firstly, it defines the foreign language anxiety concept where eventually foreign language anxiety is differentiated from other related concepts. Secondly, it reviews the existing studies where the constructs of foreign languages are determined. Finally, it presents the studies that concern foreign language anxiety and achievement in a systematic way where different settings, languages, and learners’ stages and disciplines were involved.