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!
You spawned the developers’ special figurines!
Change your color more than 50 times.
Use your personal color page in the notebook.
Play Tabletop Simulator for over 100 hours.
Play Tabletop Simulator for over 50 hours.
You tried to flip the table… and failed!
Play Tabletop Simulator for over 10 hours.
Play the game for 1 hour without flipping the table.
Play a game with someone on your friend's list
Complete the tutorial in under 30 seconds.
Spawn 10,000 poker chips!
Play a game with a full room of 8 players.
Have two RPG figurines attack one another. They must hit!
Complete the in-game tutorial.
Flip the table over 1000 times.
Play a civilized game of Chess for 1 hour.
Flip the table in an absolute fit of rage… 100 times.
Play a game in zero gravity.
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.
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.