I've completed the last 4 Cabal mission I needed for the Achievement For the Cabal, and none of them tracked on XSX.
My GT is Synthus85 I was able to get up to 9 complete directives last night but it took and extra 7 on top of the 6 I had completed. so not sure if there is a tracking issue or just my character is being weird.
EDIT I was able to finish the Achievement this morning took a total of 9 even those the tracker said I needed 4.
Could you please tell us your Gamertag? We will track your future progress, please keep completing the Cabal objectives. In case the achievement is glitched, we will handle the problem.