Full list of all 40 The Talos Principle achievements. It takes around 25-30 hours to unlock all of the achievements in the base game on Windows.
The base game contains 36 achievements, and there is 1 DLC pack containing 4 achievements.
Listen to all she has to say.
It is never too late to accept Elohim's forgiveness.
Reach the top.
Restore a backup version of yourself.
Collect all pieces of written information.
Expose the flaws in the code.
Laugh at the pointlessness of existence.
Communicate with your double.
Receive guidance from Elohim's messengers.
Find a Messenger's abode.
See what the others have to say.
Tell the others what you think.
Don't just peek. Do it.
Accept Elohim's wisdom.
Pick up a star.
Try, fail, try again, fail again, eventually succeed.
Do as you're told (for now).
Get everything on your own.
Do not allow the serpent to fill you with doubt.