Here is the full list of all 12 Futanari Jigsaw Puzzle achievements.
Complete Puzzle 4 at 160+ pieces
Complete Puzzle 3 at 160+ pieces
Complete Puzzle 2 at 160+ pieces
Complete Puzzle 1 at 160+ pieces
Complete Puzzle 5 at 160+ pieces
Complete Puzzle 6 at 160+ pieces
Complete Puzzle 7 at 160+ pieces
Complete Puzzle 8 at 160+ pieces
Complete Puzzle 9 at 160+ pieces
Complete Puzzle 10 at 160+ pieces
Complete Puzzle 11 at 160+ pieces
Complete Puzzle 12 at 160+ pieces