The Epic Games Store has announced the achievements feature. They did it on Twitter. While the function is working in test mode, they promise to improve it and fully implement it in the store soon.
The place for achievements will be a special area on the right side of the screen. However, they are not yet available for all games.
The achievements function was found by dataminers for a long time, but only now it got to the official announcement. Now it can be tested on games, including: Death Stranding Kingdom Come: Delivarence, Killing Floor 2, Death Stranding and others.