I think there are two kind of separate topics here: mindfulness meditation and enlightenment. Mindfulness meditation can be useful just as a tool to improve attention and awareness in daily life. To “achieve enlightenment” you may or may not use mindfulness meditation, and in fact it may be the wrong tool for your needs. E.g., if you really must right a wrong in your life in order for you to personally come to terms with it, no amount of mindfulness meditation will get you beyond that.