Here is the full list of all 23 Still There achievements.
Watch the credits
Complete the game
Take Gorky out with you
Draw a tally mark for each day on the Bento
Begin Final Chapter
Restore the electricity supply
Open the menu during fake credits
Eat milk
Begin Chapter Five
Give a funeral to your little friend
Hide the Bento
Fix the oxygen leakage
Take care of the tuatara
Begin Chapter Four
Win a chess match with Gorky
Drink five coffees
Fix the Cooling System
Begin Chapter Three
Decode the mysterious signal
Begin Chapter Two
Drink coffee
Wash your teeth
Begin Chapter One