Here is the full list of all 14 The Magic Circle achievements. It takes around 10-12 hours to unlock all of the achievements on Windows.
Remembered your first when it mattered
Pushed the button because you got bored
This can only be...
You will be known as the person who made that thing.
From this point on, you will have to exhaust your own content.
There is no keypad here, but you did it anyway
The boundaries of this simulation have no hold on you.
Hell hath no fury like a tester scorned.
Your Words Go Here
Old Pro had to do it for you
Got enough of Starfather's speech to make a proper mixtape
What kind of boss fight was that?
Embrace the null state
More like... Finished the "game".