Does ISO 14001 require us to comply with Pakistani environmental law?

Yes. The standard requires you to identify the legal requirements that apply to your operations and to evaluate whether you are actually meeting them. An auditor will ask to see your compliance obligations register and evidence that you review it. In practice this is one of the strongest reasons Pakistani manufacturers adopt the standard. It forces provincial environmental requirements into a documented, maintained list rather than leaving them with whoever happened to handle the last inspection.