Here is the full list of all 18 Sheltered achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Win combat using a gun
Have 5 or more plant stations in the shelter
Trap 100 animals on the shelter surface (cumulatively)
Take the RV out on an expedition
Subdue an enemy in combat
Fully upgrade all systems
Fully upgrade a system
Travel 1000 miles (cumulatively) on the map
Collect all 10 tools (on a single game)
Grow and harvest a plant from the plant station
Survive 100 days
Search 200 locations (cumulatively)
Travel 500 miles (cumulatively) on the map
Travel 100 miles (cumulatively) on the map
Trap an animal on the shelter surface
Survive a week
Upgrade a system once
Craft your first object/item