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 "Switcheroo" without using the "keep connections" option.
Solve "Seesaw" puzzle by picking up only one connector.
Talk to each member of your team.
Tell Purple what to do about his voice.
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.
Work on solving a puzzle for more than 20 minutes.
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 Lifthrasir's audio logs.
Collect all 12 of Trevor'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.
Activate the tower at the Verdant Canyon.
Activate the tower on the Southern Coast.
Find 10 ancient human artifacts.
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.
Discover a trace of what happened on the island.
Read 10 Social Media entries.
Activate the tower at the Wooded Plateau.
Solve one Sphinx monument.
Find an ancient human artifact.
Solve "Loop" without doing multiple circles.
Return to a puzzle for a second attempt.
Experience a datastream overload.
Solve one Prometheus monument.
Activate a Prometheus monument without stopping the spark-chasing music.
Find one Prometheus spark.
Solve one Pandora monument.
Activate the tower at the Grasslands Ring.
Build one bridge.
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.
Provide your digital signature to someone.
Finish the calibration process.
Get involved behind the scenes.
Explore New Jerusalem in its entirety.
Use a functioning Somnodrome.
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.