Here is the full list of all 45 Pixel Puzzles Trivia achievements.
Attain Rank: Insightful
Answer 500 Questions
Finish 10 Time Trials
Attain Rank: Graduate
Answer 100 Questions
Answer 50 Questions
Attain Rank: Novice
Collect 10 Gold Pieces
Answer 10 Questions
Collect 50 Gold Pieces
Collect 100 Gold Pieces
Collect 500 Gold Pieces
Collect 5 Diamonds
Collect 25 Diamonds
Collect 50 Diamonds
Collect 100 Diamonds
Collect 250 Diamonds
Answer 1000 Questions
Use 1 Hint Token
Attain Rank: Quick Witted
Attain Rank: Brainiac
Attain Rank: High IQ
Attain Rank: Sharp Minded
Attain Rank: Socrates
Attain Rank: Deep Thinker
Attain Rank: All Knowing
Attain Rank: Genius
Finish 10 Casual Quizzes
Finish 50 Casual Quizzes
Collect All Casual Stars
Collect All Stars
Finish 50 Time Trials
Collect All Time Trial Stars
Finish 25 Time Trials
Finish 25 Casual Quizzes
Answer 5000 Questions
Finish 10 Detonation Quizzes
Finish 25 Detonation Quizzes
Finish 50 Detonation Quizzes
Collect 1000 Gold Pieces
Finish 10 Deadline Quizzes
Finish 25 Deadline Quizzes
Finish 50 Deadline Quizzes
Collect All Deadline Stars
Collect All Detonation Stars