If you're having trouble unlocking this achievement, try this:
WARNING: You'll need your Xbox One to be online and you'll need a working internet connection when restarting the game!
After completing one, two or all three challenges for the week, exit the game (press
, highlight Halo Wars 2, press
, select Quit
) and delete your save. To delete your save, highlight Halo Wars 2 and press the Menu
on your controller. Select Manage game
and go to Saved data
. Highlight your save, press
and select Delte from console
. Next time you launch the game, it will synchronize the local data with the data in the cloud and update correctly.
Do this once a week in four consecutive weeks and the achievement should pop.
I've had trouble unlocking this achievement because when launching the game, it would randomly not find my saved data. Skulls were locked, campain logs were marked as new/unread, the game asked me if I want to play the Blitz tutorial, my campain saves were gone etc... On Halowaypoint, the daily and weekly challenges would update correctly, so I realized that there must be an issue with the startup and initial loading of the gamedata.
Try it and tell me if it worked for you.
As a sidenote on efficiency: If you're trying to get daily AND weekly challenges done, do the weekly challenges last. Completing the seven daily challenges might give you some progress towards your weekly challenges.