Here is the full list of all 59 The Talos Principle 2 achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Solve "Seesaw" puzzle by picking up only one connector.
Make a choice that will define the future.
Go above and beyond to change the future.
Defy death.
Solve all puzzles and monuments.
Find 10 ancient human artifacts.
Help Byron get elected mayor.
Discover a vision of things to come.
Activate the tower on the High Plain.
Explore all of the lost labs.
Solve all regular puzzles.
Find every manifestation of the past.
Collect all 12 of Trevor's audio logs.
Collect all 12 of Lifthrasir's audio logs.
Activate the tower in the Anthropic Hills.
Use a functioning Somnodrome.
Activate the tower in the Western Delta.
Free Prometheus from his chains.
Activate the tower at the Circular Oasis.
Activate the tower at the Verdant Canyon.
Activate the tower on the Southern Coast.
Tell Schuyler what to do with his life... or not.
Activate the tower in the Lost Marshes.
Activate a Prometheus monument without stopping the spark-chasing music.
Activate the tower in the Flooded Valley.
Activate the tower on the Desolate Island.
Read 30 texts on terminals.
Read 10 Social Media entries.
Solve one Sphinx monument.
Enter the Megastructure.
Activate the tower in the Eastern Wetlands.
Return to a puzzle for a second attempt.
Discover a trace of what happened on the island.
Work on solving a puzzle for more than 20 minutes.
Experience a datastream overload.
Solve one Prometheus monument.
Activate the tower at the Wooded Plateau.
Solve one Pandora monument.
Get involved behind the scenes.
Activate the tower at the Grasslands Ring.
Build one bridge.
Find an ancient human artifact.
Explore content on a lost terminal.
Find one Prometheus spark.
Embark on the expedition.
Explore the Museum of the Simulation in its entirety.
Visit New Jerusalem's Museum of the Simulation.
Tell Purple what to do about his voice.
Provide your digital signature to someone.
Finish the calibration process.
Explore New Jerusalem in its entirety.
Solve "Switcheroo" without using the "keep connections" option.
Solve "Loop" without doing multiple circles.
Talk to each member of your team.
Maintain the status quo in New Jerusalem... for now.
Help Rand get elected mayor.
Have a heated argument with Thecla.
Finish all three text adventures in the exhibition.
Refuse to go along on the expedition.