After building the Town Hall, accept the mission to gather 50 pieces of Lumber in your Basic Workshop and finish it. When you get the message for completing it, it will be "He's a Lumberjack and he's OK", which is a quote from Monty Python's "Lumberjack Song".
ACHIEVEMENT - HOW TO UNLOCK If I Had a Hammer (5 points) - Build a lumbermill. Siegfried (or Roy) (5 points) - Train a Kefling. Frank Lloyd (25 points) - Unlock 25 blueprints. Big Bully (15 points) - Became the big bully of the village. Haberdasher (20 points) - Encounter every possible Kefling hat. Like Rabbits (15 points) - Reach a total Kefling population of 30. Think Big (10 points) - Build a building made of at least 8 pieces. Master Builder (25 points) - Build a cathedral. King (40 points) - Finish a complete castle with three connected parts. Friend (10 points) - Collect 10 unique player banners from other giants during Xbox LIVE play. World Traveler (10 points) - Play in an online game where 20 different player banners appear. Vanity (20 points) - Built a glorious statue of oneself.