Here is the full list of all 18 Machi: Above the Void Demo achievements.
Complete
the
Complete very hard 4x4 stage
Place 50 houses
Place 500 houses
Place 1000 houses
Destroy 50 houses
Destroy
Play 50 levels 4x4
Play 50 levels 5x5
Play 50 levels 6x6
Start multiplayer
Win in multiplayer
Win in all modes of multiplayer