Here is the full list of all 7 Luxocraft achievements.
The base game contains 6 achievements, and there is 1 DLC pack containing 1 achievements.
The count of created Free [Ready-To-Use] Workshop Items
The count of created Paid [Curated] Workshop Items
The count of created Blocks (any shapes)
The count of created Group Blocks (any shapes)
The count of used Unique Materials
The count of used Variation Materials
You receive a prize when you start the game for the first time