Here is the full list of all 35 The Detractor achievements.
Win an arm wrestling match 10 times.
Defeat 150 opponents.
Reach a combo score of 30.
Reach a score of 10 at the piano.
Complete chapter II.
Score 10 points at Flappy Pig.
Defeat 100 opponents.
Defeat 75 opponents.
Complete chapter I.
Win an arm wrestling match 5 times.
Defeat 50 opponents.
Reach a combo score of 20.
Defeat 25 opponents.
Reach a score of 6 at the piano.
Reach a score of 8 at the piano.
Defeat 10 opponents.
Defeat your first opponent.
Win an arm wrestling match.
Complete the puzzle game under 20 seconds.
Complete the puzzle game under 15 seconds.
Reach a combo score of 10.
Complete chapter III.
Reach a punch score of 70.
Reach a punch score of 80.
Reach a punch score of 90.
Complete the memory puzzle under 25 seconds.
Complete the memory puzzle under 18 seconds.
Complete the memory puzzle under 11 seconds.
Complete the puzzle game under 10 seconds.
Score 20 points at Flappy Pig.
Score 40 points at Flappy Pig.
Complete the game.
Complete the game without taking a hit.
Complete the game without using items.
Complete the game without casting any spell.