Zalexzy said:You can get these with proper time stamps too. Just go back in time, do challenge and check challenge tracker between missions so you know when it will completed.
After starting mission final time for challenge completion, change date back to current day, and once you fulfill challenge requirement achievements pop with stamp on current date.
Can confirm this still works as of 10/11/21.
I first completed on the 360, then the One and just now am making my way through it for the 3rd time. Worked like a charm, thanks Zalexzy!