Here is the full list of all 28 1849 achievements.
The base game contains 18 achievements, and there is 1 DLC pack containing 10 achievements.
Complete the public office commission in the San Francisco scenario.
Complete the grand mansion commission in the San Francisco scenario.
Build 20 California cities
Build 15 California cities
Stockpile 1,000 units of gold in your depot. Just in case you need it.
Build eight or more mines of any type on the same map.
Construct a sheriff, fire brigade, saloon, school, church and jail in the same town.
Build 10 California cities
Build five California cities
Build three California cities
Create a town that attracts at least 300 residents.
Build at least six breweries, distilleries or wineries on one map.
Build 10 or more farms of any type on one map.
Build five or more hunting or logging camps on the same map.
Accumulate $10,000 in cold hard cash
Build a a city that attracts at least 200 residents.
Build a town that attracts at least 100 residents.
Attract 50 residents to your town.
Complete the Carson City scenario in Nevada
Build the Nevada State Capitol
Complete the deep mine in Carson City
Complete the Governor quest in Carson City
Complete the Virginia City scenario in Nevada
Complete the Virginia and Truckee Railroad
Complete the Gold Hill scenario in Nevada
Complete the Silver City scenario in Nevada
Complete the Washoe City scenario in Nevada
Complete the Dayton scenario in Nevada