Here is the full list of all 20 The Jackbox Party Pack achievements.
Win a game by more than 3000 points
Guess every drawing correctly in a game
Draw something that everyone guesses correctly
Fool every other player with your title of another player's drawing
Win three rounds in a row
Play a perfect round where all words get accepted
Type the word "nugget" and get it accepted
Play a full 8-player game
Win three games in a row
Play a game with 10 or more players
Play a perfect round
Enter one of the 7 bugs' secret names as your name
All players find the truth on a question
Fool every other player with a Lie in a 3+ player game
Enter the same thing as another player
Write a Lie that's actually the Truth
Win all Wrong Answer of the Game prizes
Get all questions right in an episode
Ace a DisOrDat
Come from behind to win during the Jack Attack