Yes. There are three other ways to qualify for a second citizenship.
Investment: Certain countries will grant citizenship to people who make a donation to the government, or invest in certain property or businesses in a country. These programs are quick, but they generally cost at least six figures, and can easily run into the millions for the European options.
Time: After you live in a country long enough, you can become eligible for a second passport through naturalization. This option usually takes several years, but the advantage is that anyone can do this. And in some countries you don't even have to spend much time there.
Flexibility: These are unconventional ways to get a second citizenship and passport, such as giving birth in a foreign country, marrying a foreign citizen or even changing your religion…
We cover all four ways to get a second passport in this free article.