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