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.
The garden has found life.
All six garden runes collected.
Garden vision puzzle solved.
The mechanisms of the tower are back in operation.
All six tower runes collected.
Tower vision puzzle solved.
The torch of the lighthouse burns brightly once more.
All six lighthouse runes collected.
Lighthouse vision puzzle solved.