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.
Collect all pieces of written information.
Laugh at the pointlessness of existence.
Restore a backup version of yourself.
It is never too late to accept Elohim's forgiveness.
Reach the top.
Don't just peek. Do it.
Do as you're told (for now).
Get everything on your own.
Expose the flaws in the code.
See what the others have to say.
Find a Messenger's abode.
Tell the others what you think.
Pick up a star.
Try, fail, try again, fail again, eventually succeed.
Accept Elohim's wisdom.
Receive guidance from Elohim's messengers.
Communicate with your double.
Do not allow the serpent to fill you with doubt.