How to get New Zealand citizenship

Can I keep my other citizenship ie get dual citizenship?

While New Zealand has no issues with dual citizenship, this may not be the case for your home country. You can be a citizen of New Zealand and another country at the same time — unless the other country does not allow it. To check what the other country’s rules are, contact the foreign representative to New Zealand. There are many countries that will cancel your citizenship if you adopt another country's passport. Other countries are somewhat a bit more flexible and an official request must be made if you wish to retain your home citizenship, before you seek a New Zealand passport.