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