UPDATE 04/10/2022
As
Morpheus414 mentioned in his comment to my solution,
Halowaypoint does not track our Halo Wars 2 stats anymore.
The solution should still work, you just have to rely on your own memory or take notes when you started certain challenges, if you did your weeklys/dailys etc.
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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 button
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.
Further explanation:
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.