| Achievement | How to unlock
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| - Win a game where you always had more Knights than City Improvements.
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| - Build your roads, settlements, and cities exclusively on coasts.
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| - Become "Defender of Catan" five times in a single game.
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| - Win a game by having the Largest Army and the Longest Road.
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| - Build settlements on all the islands in a Seafarers scenario.
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| - Reveal 10 fog-covered hexes in a single game.
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| - Get all 3 Metropolises in a game.
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- Knights of the Round Table
| - Play 12 Knight Cards in a single game.
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| - Win a game without trading (fellow players AND bank).
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| - Build all your settlements and cities next to a single type of resource and win.
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| - Build a Settlement or a City at every number in a game.
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| - Move the Robber to a player who currently holds no cards in his hand.
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| - End the game having never lost a City to the Barbarians while never building a Knight.
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| - Collect 20 resources in your hand.
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| - Place the Robber on a hex where he will affect no one.
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| - Interrupt the longest road belonging to an opponent.
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| - Build a road with 15 or more segments.
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| - Rob your opponents 10 times in a single game.
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| - Play and defeat all the computer characters in custom games.
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| - Win a game with more than a 5-point advantage.
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| - Only trade with your fellow players at least 2:1 in your favor and win.
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| - Find 5 treasures in a single game.
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| - Cause 5 Barbarian attacks in a game.
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| - Build a Mighty Knight, a City Wall, and a Metropolis and move the Merchant in a game.
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| - Win a game without building a city.
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| - Have three Cities with City Walls in a game.
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| - Possess at least 3 harbors.
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| - Trade 42 times 1 Lumber for 1 Wool in a game.
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