Here is the full list of all 7 Rituals achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
You saved the planet, let the silence be your reward.
You're a master locksmith.
You read all the magazines!
You fed the crocodile more than three times.
The lift's not there.
You discovered a secret surveillance room.
You either misread Gaia's messages or wanted to end the human race. The Earth is no more.