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