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.
Helped out with building 100 buildings.
Finished the Giant's Gift. How relaxing!
Talked to the whole family of builder brothers.
Expressed yourself with 20 different emotes. Strike a pose!
Visited the Ice Kingdom, the Desert Kingdom, and the Forest Kingdom
Helped enhance your world with culture stars
Got to know Doug pretty well. Does he ever stop talking?
Started 10 buildings the builders finished without you
Watched a kefling bounce through a long series of cannons
Thawed out poor frozen Doug
Receive Collectibles from a friend
Adorn your world with 25 unique decorative pieces
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