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Taiwan's Bureau of Consular Affairs maintains a webpage where visa information for the Republic of China (R.O.C., or Taiwan) is presented in English. That page contains the following, which sets requirements for a Pakistani citizen (as well as citizens of the other 16 countries listed, which names I've omitted from this Answer) to obtain a visa to enter Taiwan.
"Nationals from the following countries applying for visitor visas to the R.O.C. must fulfill the procedure of this sectionοΌ
...
"Pakistan
...
"Nationals of the designated countries may apply for the R.O.C. visitor visas for the following purposesοΌ
Invited by the Republic of China (R.O.C.) government agencies on official missions
Participating in international meetings or activities for the purposes of religious, athletic, or cultural exchange, which are held by the organizations set up in the R.O.C.
Crew members intending to come to the R.O.C. to report for duty.
Medical treatment."
Unless your planned trip to Taiwan fits within one of these six categories, you will not quaify for a visa.