Not only can you get points for your healthy activities like walking and logging food, but you can also earn points through offers and surveys. Offers were created to incentivize you to consider your health in different ways and to provide you with more point earning opportunities. They can range from Refer a Friend to participation in research. Offers are located on the upper portion of your homepage in the Achievement app, and are updated on a regular basis.
To learn more about health studies, check out How do I participate in research?