Here is the full list of all 10 Fibbage XL achievements.
Play a full game with 8 players
Enter the same thing as another player
Write a Lie that's actually the Truth
Fool every other player with a Lie in a 3+ player game
Use the "lie for me!" button
Win the Thumbs Cup
All players find the truth on a question
Trick someone with one of your Lies
Enter a Lie
Play through all the questions in the game