Awesome question - it's one of our favourite things!
To start, log in and head to My Account -> Points & Badges. From here you can see all the badges you've already got and all the ones that you can still collect. Plus, you can see what you have to do to earn them and the points you'll get.
At the moment, some badges are automated and will be applied automatically, but others we don't currently have a way of automatically tracking these actions - for example, posting on social media. So please either fill in the info via the website or app, or shoot us an email and let us know and we can apply the badge manually.