Here is the full list of all 27 Tabletop Simulator achievements. It takes around 200 hours to unlock all of the achievements on Windows.
You posted a message in global chat, hurray!
Complete the in-game tutorial.
Change your color more than 50 times.
Flip the table over 1000 times.
You tried to flip the table… and failed!
Play a civilized game of Chess for 1 hour.
Complete the tutorial in under 30 seconds.
Flip the table in an absolute fit of rage… 100 times.
Spawn 10,000 poker chips!
Have two RPG figurines attack one another. They must hit!
Play a game with a full room of 8 players.
Play a game in zero gravity.
Play the game for 1 hour without flipping the table.
Use your personal color page in the notebook.
Save 100 items to your Chest.
Create an 8 player “light show” with the line drawing tool.
Lock 5000 items over time.
Tint 1000 objects a different color.
You spawned the developers’ special figurines!
Play a game with someone on your friend's list
Upload at least 3 legitimate Steam Workshop items.
Play Tabletop Simulator for over 10 hours.
Play Tabletop Simulator for over 50 hours.
Play Tabletop Simulator for over 100 hours.
Play Tabletop Simulator for over 200 hours.
Play Tabletop Simulator for over 500 hours.
Play Tabletop Simulator for over 1000 hours.