Here is the full list of all 100 Hentai Mosaique Puzzle achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
COMPLETE THE FINAL MICHIKO & KAORI STAGE AND GET HER UNDRESSED
PEEKER!
FINALLY!!
COMPLETE THE FINAL NATSUMI STAGE AND GET HER UNDRESSED
TOO MUCH!! STHAP!
PUZZLE SOLVING OVERLOAD!
PUZZLE SOLVING SPREE!
SOLVED!
WELL THAT'S A LOT
BLOCKS FITTED SOME PUZZLE PIECES!
FITTED SOME PUZZLE PIECES!
NICELY PACKED TOGETHER!
3 TIMES CHEATED?
...AND THERE IS THE SECOND TIME
LOOK HOW AWESOME I AM!
THERE YOU GO!
COMPLETE THE FINAL RIKA STAGE AND GET HER UNDRESSED
THERE IS ALWAYS THE FIRST TIME!
FITTED SOME PUZZLE PIECES TOGETHER!
AND ANOTHER ONE!
ANOTHER ONE!
CLICK THE PUZZLE PIECES 1000 TIMES
THAT'S A LOT OF PUZZLES
COMPLETE THE FINAL MIKO STAGE AND GET HER UNDRESSED
COMPLETE THE FINAL KYOKO STAGE AND GET HER UNDRESSED
GOOD PROGRESS!!!
COMPLETE THE FINAL HAICHI STAGE AND GET HER UNDRESSED
COMPLETE THE FINAL AKIKO STAGE AND GET HER UNDRESSED
CLICK THE PUZZLE PIECES 500 TIMES
GREAT START!
CLICK THE PUZZLE PIECES 100 TIMES