Here is the full list of all 15 Post-Apo Builder Demo achievements.
Win demo
Poison the tribal people
Have 36 people join the community
Build a Doll House
Build main gate
Complete the tutorial
Build a solar panel
Unlock the 2 tech level
Build a water windmill
First death of citizen
Send your first expedition
Build any vechicle
rebuild destroyed bridge
Destroy enemy at the location
Build bug farm