Here is the full list of all 13 World Turtles Demo achievements.
Start a new game in the demo
Construct a Woodcutter's Cabin
Upgrade a Woodcutter's Cabin to Crafter
Construct a Farm
Upgrade a Farm to Crafter
Construct a Stonemason's Cabin
Construct a Builder's Cabin
Construct a Wanderer's Cabin
Construct a Fishmonger's Cabin
Upgrade a Stonemason to Crafter
Upgrade a Builder to Crafter
Upgrade a Wanderer to Crafter
Upgrade a Fishmonger to Crafter