Full list of all 12 A Kingdom for Keflings achievements worth 200 gamerscore. It takes around 8-10 hours to unlock all of the achievements on Xbox 360.
Reached a total Kefling population of 30 (Single Player)
Became the big bully of the village (Single Player)
Unlocked 25 blueprints (Single Player)
Built a building made of more than 8 pieces (Single Player)
Built a lumbermill (Single Player)
Trained a Kefling (Single Player)
Encounter every possible Kefling hat (Single Player)
Build a cathedral (Single Player)
Finish a complete castle with three connected parts (Single Player)
Collect 10 unique player banners from other giants during Xbox LIVE play
Play in an online game where 20 different player banners appear
Secret