After passing F1 - F9, you can get Bsc Hons degree awarded by OBU by completing the research analysis project (RAP) given by OBU. After, You can Apply to any well recognized university for your higher level qualification. But remember that NUST(National University of Science and Technology) is very highly profiled university. They will require many other formalities before giving admission to MBA like interviews. However, if you pass all 14 papers of ACCA and complete professional experience requirement, you will be awarded M.COM degree(University of Punjab) from HEC. As HEC (Higher Education Commission) of Pakistan recognized ACCA as equivalent to Masters of Commerce.
It is however very difficult to study MBA and ACCA together as both are professional studies and needs time and commitment. But I must say this will be a great opportunity to sound your C.V as higher will be the certificates or degrees higher the achievements and ultimately success.