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