Here is the full list of all 20 A World of Keflings (Windows) achievements worth 200 gamerscore.
Performed each of the dance emotes
Painted 20 different buildings
Built 53 machines
Unlocked all the collectible pieces
Kicked 150 Keflings
Found all the items in the world
Built a piece from each custom workshop
Built the Castle
Participated in 60 Kefling's stories
Talked to each quest giver
Placed one of each bridge in each kingdom
Built a Monstrous Perch for Mr. Feathers
Pushed 30 buildings
Painted all the sheep
Got all the speed and strength potions
Built a Tent and Igloo in the Forest Kingdom
Built the Metal Trader
Activated a building by bouncing a kefling through a cannon
Laughed with 35 Keflings
Scared away the dragon