I received a report from a user that the achievement points shown in the API and on the armory was 10 less than what they saw in-game. I checked one of my own characters and saw the same problem. This may have been happening since the new covenant upgrade achievements were hotfixed in.
Example API Calls:
Notice that achievement_points says 35,120, but in-game I have 35,130. I made sure to logout and exit game to make sure it wasn’t just a delay in updating the API stats.