The achievement system has been completely overhauled, and thanks to this update there will now be a new menu where all achievements will be listed. When an achievement is reached, click on the claim button and you'll receive the steam achievement. This new system allows you to view your progress directly in-game, and instantly unlock your Steam achievements.
Here are the update details:
https://store.steampowered.com/app/3070330/Croissant/