Here is the full list of all 103 Pixel Puzzles Musical achievements.
Place 500 Pieces
Place 1,000 Pieces
Place 1,500 Pieces
Place 2,500 Pieces
Place 5,000 Pieces
Place Your First Piece
Place 100 Pieces
Complete Your First Puzzle
Complete 10 Puzzles
Complete 5 Puzzles
Complete 20 Puzzles
Complete 50 Puzzles
Puzzle Complete
Pack Complete
Complete Pack