Here is the full list of all 14 The First Tree achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Uncover all secrets and discover a priceless treasure
Activate all of the obsidian rocks and unlock the way
Dig up your first item
Catch your first bunny
Find your name again in a familiar place
Find your name
Collect all 150 stars
Find all 5 secret items
Reveal the king of the rabbits!
Find a secret item
Finish the game
Uncover all main items in the game
Collect 100 stars
Collect 50 stars