Here is the full list of all 10 Fibbage XL achievements.
Win the Thumbs Cup
Enter the same thing as another player
Use the "lie for me!" button
Fool every other player with a Lie in a 3+ player game
Write a Lie that's actually the Truth
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
Play a full game with 8 players