Here is the full list of all 33 YOU DON'T KNOW JACK achievements.
Come from behind to win during the Jack Attack in a 2-player game
Laugh at a an easy joke
Answer all 7 DisOrDat items correctly
Score at least $30,000 over your average
Screw someone for the first time
Listen to all commercials after one episode
Finish an episode
Complete DisOrDat in 30 seconds
Play Episodes 1-73
Get -$1 million on a Jack Attack
Play Episodes 1-36
Play Episodes 1-37
Win all prizes in Episodes 1-73
Get every question right in an episode
Finish 5 single-player games on Friday or Saturday nights
Play on July 4th instead of celebrating America
Get all 7 Jack Attack questions correct without messing up in a 2-player game
Ace a DisOrDat in under 10 seconds
Get a multiple choice question right in the first 2 seconds
Get a multiple choice question right in the last 1 second
Achieve highest gamer rating
Achieve second-highest rating
Achieve third-highest rating achievement
Choose wrong answer within the first 3 seconds 10 times
Play 5 hours without getting a single achievement
Earn $100000 lifetime
Earn $500000 lifetime
Earn $1000000 lifetime
Get 10 movie questions correct (excluding DLC)
Get 10 food questions correct (excluding DLC)
Get 10 animal questions correct (excluding DLC)
Get 10 history questions correct (excluding DLC)
Find the very important gauntlet of fire