Here is the full list of all 16 Buildanauts achievements.
Build your first intersection
Build 15 Houses
Destroy 25 Town Items
Reach a happiness level of 80 or higher
Place 50 trees
Run for 500 Kilometers (310 miles)
Build 1 kilometer of road
Build 1 kilometer of sidewalks
Place 50 town items
Have a total revenue of $250,000
Reach a population of 40
Build your first Restaurant
Have total expenses exceeding $100,000
Build your first Crosswalk
Build your first house
Have at least 1 of each structure type