Achievement Dates

I use legacy on my account and ı want to show my played hours on steam but steam achievements like ''first prestige date '' this makes me intelligible
so, Is there a way to change achievements dates on steam

Yes it is.
If you have level 10 you can add a showcase to your profile. U can showcase favorite game (u will put dead by daylight) and it won't show prestige achievements date

I tried to do the same thing, and yes you can change achievement dates, but only to a newer date. Theres no way to set achievement dates back.