Here is the full list of all 27 Pixel Puzzles 2: Anime achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Complete All Puzzle
Complete Puzzle 20
Complete Puzzle 22
Complete Puzzle 23
Complete Puzzle 21
Complete DL-TV Puzzle
Complete Puzzle 25
Complete Puzzle 24
Complete Puzzle 14
Complete Puzzle 16
Complete Puzzle 15
Complete Puzzle 18
Complete Puzzle 12
Complete Puzzle 10
Complete Puzzle 6
Complete Puzzle 17
Complete Puzzle 5
Complete Puzzle 13
Complete Puzzle 7
Complete Puzzle 11
Complete Puzzle 8
Complete Puzzle 3
Complete Puzzle 4
Complete Puzzle 2
Complete Puzzle 9
Complete Puzzle 19
Complete Puzzle 1