Here is the full list of all 11 Kairo achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Secret ending discovered.
Final seal unlocked.
Garden vision puzzle solved.
All six garden runes collected.
All six tower runes collected.
Tower vision puzzle solved.
Lighthouse vision puzzle solved.
All six lighthouse runes collected.
The garden has found life.
The mechanisms of the tower are back in operation.
The torch of the lighthouse burns brightly once more.