If you complete an achievement post on the Newcomers’ community, you get a label corresponding to the achievement as shown below;

This screenshot is from a user that has completed the achievement posts up to achievement 4.

To see your subscriptions go over to your profile and click on Communities. You’d see the communities you have subscribed to and the your labels there.

I checked your subscriptions and you are subscribed to the Newcomers’ community.

As indicated, you currently do not have any label on the Newcomers’ community meaning that you have not completed any of the achievement task.

You can go over to the Newcomers’ community and complete these Achievement Tasks. You have to complete them in order (i.e 1, 2, 3, 4) and you have to make the posts in the Newcomers’ Community.

I hope you understand. Thanks.