Teaching is a profession that requires commitment to make difference in the lives of human beings. This prophecy profession is accompanied through nation builders and architecture of societies; teachers. Teachers bring into play different teaching methods to meet educational objectives to foster learning for students' achievement scores. Current study was conducted to explore the effect of teachers' teaching methods on students' achievement scores. Study was quantitative in nature and researchers applied "ex-post-facto" research design. Sample of the study consisted of 800 randomly selected tenth grade students enrolled in public-sector schools of District Kasur of Lahore Division. Data were collected by self-constructed questionnaire having fifteen items mode of 5-point Likert type options. Students' achievement scores were obtained from Gazette Notification of Board of Intermediate and Secondary Education, Lahore. Content validity of self-constructed questionnaire was ensured from experts and Cronbach's Alpha reliability was censured in SPSS; 0.864. Researchers personally collected data from respondents after ensuring ethical consideration prior to collect data. Results of linear and multiple regression analysis report that overall secondary schools' teachers teaching methods have affected 52% on students' achievement scores whereas lecture method 65.6%, question answer 49.2%, discussion 49.5% and demonstration method have affected 39.6% on students' achievement scores. On the basis of results, it is recommended that heads of public sector educational institutions and secondary schools teachers make sure to apply teaching methods as their continuous usage indulged students towards effective learning that put significant effect on students' achievement scores.