There are two ways possible to achieve Dutch citizenship as an expat, the option procedure and the naturalization procedure. The option procedure is the easiest out of the two and should be applied for first, if it seems you satisfy these requirements: lived in the Netherlands or a Dutch territory most of your life; married to or have lived with a Dutch citizen for at least three years and have lived in the Netherlands for fifteen years consecutively; are over 65 and have lived in the Netherlands for at least 15 years; or one of your parents or legal guardians is Dutch and you have lived with them in the Netherlands for at least three years before applying.
If you are not fortunate enough to take the easy route when gaining Dutch citizenship, the naturalization procedure is for you. It requires you to have either lived in the Netherlands for a consecutive five years with a valid residence permit; been married to a Dutch national, or lived with a Dutch national for three consecutive years; or you have lived in the Netherlands for a period of ten years with the last two years being consecutive. In order to prove you are fully integrated into Dutch society, you must take a civic integration exam, which tests your ability to read, write, speak, and understand Dutch at an A2 level. Lastly, you must be ready to denounce your previous citizenship.
Gaining Dutch citizenship is not for the faint of heart. Especially if you need to take the naturalization route, there is a need to start learning the Dutch language as soon as possible. During the minimum five years of time allotted before you are able to apply, it is important to immerse yourself fully in the Dutch culture. As an expat, it is difficult to stray away from the communities from which we originally derive. Through meet-ups, neighbourhood friends, and co-workers, it is possible to gain Dutch friends and experiences. Or, as many other Dutch residents have told me, if you want to stay in the Netherlands, it is best to find a Dutch partner.