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