Here is the full list of all 20 The Jackbox Party Pack 3 achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Win all your battles in Round 1, but lose all your battles in Round 2
Get a Super Quiplash! (all player votes and 90% audience votes in a 5+ player game)
Answer 5 Trivia Questions in a row correctly
Faker gets through three tasks in a row without a single vote (or two tasks for three player games).
Catch the Faker on the first vote.
Pick top three answers in final round
Guess the exact percentage
Survive The Killing Floor 3 times in one game
Create a custom game
Write "gravy castle" and win a battle with it
Use all of your colors in a single drawing that then gets used on a shirt
Vote against your own shirt in a battle
Get all the votes in a single battle in a 5+ player game
Be the creator of every shirt in the final gauntlet
Play five games of Fakin' It in a row.
Play 40 You Gotta Point tasks.
Play 3 games in a row with the same players
Get a score of 25 or more in the Math Killing Floor
Perfect guessing of higher/lower
Guess within 5% of an audience's answer