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