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.
Help Byron get elected mayor.
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.
Solve one Prometheus monument.
Find an ancient human artifact.
Activate the tower on the Southern Coast.
Activate the tower in the Lost Marshes.
Activate the tower in the Flooded Valley.
Activate the tower on the Desolate Island.
Talk to each member of your team.
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.
Read 10 Social Media entries.
Experience a datastream overload.
Find one Prometheus spark.
Activate the tower at the Wooded Plateau.
Return to a puzzle for a second attempt.
Get involved behind the scenes.
Activate the tower at the Grasslands Ring.
Build one bridge.
Explore content on a lost terminal.
Embark on the expedition.
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.
Tell Schuyler what to do with his life... or not.
Finish the calibration process.
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.
Explore all of the lost labs.
Solve one Pandora monument.
Solve one Sphinx monument.
Discover a vision of things to come.
Solve "Switcheroo" without using the "keep connections" option.
Solve "Loop" without doing multiple circles.
Solve "Seesaw" puzzle by picking up only one connector.
Activate a Prometheus monument without stopping the spark-chasing music.
Collect all 12 of Trevor's audio logs.
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.
Find every manifestation of the past.
Find 10 ancient human artifacts.