Originally posted by Wariat117:

because no reason to add them

Originally posted by grapplehoeker:

If achievements were to be added, it will usually happen once the game reaches a full release version and leaves EA.

I haven't seen games that add such stuff after EA ;d
Usually they add it during EA, like ARK, The Forest etc

Hades added achivements closer to release.
It makes more sense to wait and add them later when the game is closer to finished instead of doing so now as they will have a better idea of what to even make the achivements.