You can now hide individual Achievements.
Navigate to Achievements on your profile sidebar and click on an achievement to get started. Once in the detail view, the eye icon will indicate the current visibility of the achievement. Click on the eye icon to hide the achievement. When hidden, they are only visible to you.

You can still opt out of Achievements as a whole in your Profile Settings.
For more information, see Changing the visibility of Achievements. If you have any feedback to help us improve Achievements, be sure to post it in our discussions forum.

Formed in 2009, the Archive Team (not to be confused with the archive.org Archive-It Team) is a rogue archivist collective dedicated to saving copies of rapidly dying or deleted websites for the sake of history and digital heritage. The group is 100% composed of volunteers and interested parties, and has expanded into a large amount of related projects for saving online and digital history.

