Here is the full list of all 20 The Jackbox Party Pack 8 achievements.
Had your question answered two games in a row
At least one detective got every case right, including Cold Cases
Earned the power slice every round in a single game
Spun the wheel when all players had enough points to win the game
Earned over 10000 points from a single slice
Got two Synergies in one round
Played Friend Mode
Fooled the same player three times in a game
Used all three colors in an animation
Played the game at midnight
Your team went an entire round without selecting an incorrect door
Got a Rainbow Bonus in all three rounds
Poked the logo 40 times
Used the word "accomplishment" in a title
Played a game every weekday between 9am and 5pm
In round one, picked the eighth place door on first guess
Won a game by yourself against nine people
In Streamer Mode, played against an audience of 1,000 or more
A single Accomplice received 10 murder attempts
An Accomplice named Schmitty was murdered