Here is the full list of all 31 Going Medieval achievements.
Survive the First Day
Harvest 5 Crops
Harvest 200 Crops
Produce a Meal at a Campfire
Store 20,000 Nutrition
Unlock First Research Item
Unlock 3x Research Items
Build a Wooden Beam
Build an Enclosed Room
Kill a Raider
Survive for Seven Days
Survive the First Raid
Survive Until the First Summer
Survive Until the First Autumn
Survive Until the First Winter
Survive a Full Year
Gather 10x Settlers
Dismantle 50x items
Harvest 50 Crops
Store 5000 Nutrition
Store 10,000 Nutrition
Unlock 5x Research Items
Unlock 10x Research Items
Unlock 25x Research Items
Hunt 5x Deer
Hunt 20x Deer
Hunt 5x Hares
Hunt 20x Hares
Hunt 5x Wolves
Hunt 20x Wolves
Dismantle 5x Items