We have already added and fixed achievements in ArcBall & ArcBall 2.
Now you can get about 1000 achievements in each of them.More achievements will be available to receive them soon.
New achievements!
Source: Steam Community (opens in a new tab)
Build and release context
Steam update times within 24 hours of this post. Matching dates do not confirm which build it describes.
Build 2920834 · public branch
Steam updated · First observed