There are many difficult achievements in "Frost Age 2", and Quiet Village is one of them. To achieve this achievement, you only need to have a colony with no more than minor problems, and it lasts for 300 weeks. The colonial problem is still quite troublesome.
How to obtain the Quiet Village achievement in Ice Age 2
Quiet countryside
Own a colony with no more than minor problems for 300 weeks.
Maintain supply of the old Terrorship colony after the white-out phenomenon in story mode. The composites factory would allow them to produce their own materials and therefore their own goods, so they would only need food from New London.