Eff GX has just submitted some Achievement Flag Info for
Project Spark (Windows):
Eff GX said:This can already be marked as partially unobtainable, like Weekly Warrior.
As per Musquitos solution and my observation, there are 3 types of countable challenges: Milestones, which will count as 11 max. Goals, which sum up to 9. And dailys, where you get one per day per character. So asuming you have all milestones and goals completed, you will still need 30 dailys, meaning it will take 30 days. As the service goes offline on August 12th, there are only 20 days left. (counting today, july 24th, and august 12th into it) So it's not obtainable anymore if you don't have at least 10 dailys done before. (And progress or unlock on X1 won't transfer for PC.)
Thus I would suggest marking it partially unobtainable.
(I figured it out, while checking if I will reach it in time ... Sadly not ...)
This can already be marked as partially unobtainable, like Weekly Warrior.
As per Musquitos solution and my observation, there are 3 types of countable challenges: Milestones, which will count as 11 max. Goals, which sum up to 6. And dailys, where you get one per day per character. So asuming you have all milestones and goals completed, you will still need 33 dailys, meaning it will take 33 days. As the service goes offline on August 12th, there are only 20 days left. (counting today, july 24th, and august 12th into it) So it's not obtainable anymore if you don't have at least 13 dailys done before. (And progress or unlock on X1 won't transfer for PC.)
Thus I would suggest marking it partially unobtainable.
(I figured it out, while checking if I will reach it in time ... Sadly not ...)