Here is the full list of all 23 Minimal achievements.
Finish "Mordor" stage
Finish 50 levels
Finish "Anchor" stage
Finish 25 levels
Finish 10 levels
Finish 1st level
Finish 75 levels
Finish 100 levels
Finish 125 levels
Finish 150 levels
Finish 175 levels
Finish 200 levels
Finish 225 levels
Finish 250 levels
Become best drummer in the world
Scroll the credits all the way down
Make 99 flips in one stage
Flip same tile 5 times in row
Flip 1000 tiles
Complete all levels on par
Finish "UFO" stage
Finish "Helmet" stage
Finish "Pyramide" stage