Here is the full list of all 19 Are You Smarter Than a 5th Grader? achievements worth 1,000 gamerscore.
Play "Exam" Mode.
Beat "Exam" Mode
Beat "Exam" Mode without using any cheats.
Play "Study" Mode with exactly 1 player.
Play "Study" Mode with more than 1 player.
Play "Study" Mode with the maximum number of 8 players.
Get an overall grade of A+ with one avatar that has answered over 100 questions.
Get an overall grade of A or higher with one avatar that has answered over 100 questions.
Get "Reference Checker" at the end of a game session 10 times.
Get "Independent Student" at the end of a game session 10 times.
Get "Head Bobbler" at the end of a game session.
Get "Unlucky" at the end of a game session.
Get all 8 Stage "Prodigy" Medals.
Reach 1st Grade in the Permanent Record.
Reach 2nd Grade in the Permanent Record.
Reach 3rd Grade in the Permanent Record.
Reach 4th Grade in the Permanent Record.
Reach 5th Grade in the Permanent Record.
Reach 6th Grade in the Permanent Record.