Oh, I guess I know what causes this problem. We have recently adjusted default template for config file - so that it would work with PPA, but I believe you have been using the application before we introduced these changes, and your configuration is now invalid.
To reinitialize configuration, please run:
and then restart the daemon and viewer. That should help.
Let me know about results, and in case this would not solve your problem, please include the contents of the (new) ~/.config/accomplishments/.accomplishments file.