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