Here is the full list of all 20 The Jackbox Party Pack 6 achievements.
Win all three rounds in a 3-5 player game
Write a sentence in Round 3 that uses the entire character limit
Use the phrase "mucus ranch" and win a round with it
Your definition gets all the player votes and 90% of the audience
Humans win with one second or less remaining on the clock
Aliens win in under five minutes
The aliens win the game after a failed vote where they were properly isolated
Aliens win without using hacks
Win every matchup
All players get a role without tiebreakers in a 6 player game
Win a game as the audience
Crack someone's password
Survive the game (and then some) while wearing Father's Hat
Get a role you doubled down on
Everyone but you chooses you for a role
Get all the votes in an old favorite
You beat a joke that previously received unanimous votes in a 5-8 player game
You elect to perform every joke
Compete against a joke that previously received zero points
Get a consolation role