Full list of all 21 A World of Keflings achievements worth 450 gamerscore. It takes around 6-8 hours to unlock all of the achievements in the base game.
The base game contains 12 achievements worth 200 Gamerscore, and there are 3 DLC packs containing 9 achievements worth 250 Gamerscore.
Thaw out poor frozen Doug
Receive Collectibles from a friend
Watch a kefling bounce through a long series of cannons
Help enhance your world with plenty of culture stars from fancy buildings
Visit the Ice Kingdom, the Desert Kingdom, and the Forest Kingdom
Talk to the whole family of builder brothers
Express yourself with 20 different emotes
Get to know Doug through different conversations
Start 10 buildings the builders finish without you
Adorn your world with 25 unique decorative pieces
Help out with building 100 buildings
Help finish the Giant's Gift from the pieces the keflings give you
Help build the Ubertronic Dynabot
Help create a Nuclear Lobster
Get past the meteor to explore the map
Save the Caramel Lake
Help find Augustus and his hidden treats
Help restore Charlie to the Fudge Fortress
Help create a Scarecrow
Help build the Franken-builder
See the epic confrontation between Zombie-saurus and the Vampire Ape