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.
Play 40 You Gotta Point tasks.
Play five games of Fakin' It in a row.
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.
Answer 5 Trivia Questions in a row correctly
Get a score of 25 or more in the Math Killing Floor
Be the creator of every shirt in the final gauntlet
Pick top three answers in final round
Perfect guessing of higher/lower
Guess within 5% of an audience's answer
Guess the exact percentage
Get a Super Quiplash! (all player votes and 90% audience votes in a 5+ player game)
Write "gravy castle" and win a battle with it
Create a custom game
Play 3 games in a row with the same players
Use all of your colors in a single drawing that then gets used on a shirt
Get all the votes in a single battle in a 5+ player game
Vote against your own shirt in a battle
Survive The Killing Floor 3 times in one game
Win all your battles in Round 1, but lose all your battles in Round 2