Here is the full list of all 16 Piczle Lines DX achievements.
You cleared all chapter 3 puzzles!
You cleared all chapter 2 puzzles!
Clear 50 puzzles in total.
Clear all puzzles in the "Vehicles" puzzle pack.
Clear a humongous 128x128 sized puzzle.
You cleared all chapter 1 puzzles!
Clear 10 puzzles in total.
Clear any medium or bigger puzzle without having to delete any lines.
Clear your very 1st puzzle ever!
Check the toturial.
Check out the credits screen.
You cleared all chapter 4 puzzles!
You cleared all chapter 5 puzzles!
Clear 100 puzzles in total.
Clear 250 puzzles in total.
Clear a humongous 128x128 sized puzzle and then RESET it!