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