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!
COMPLETE THE FINAL NATSUMI STAGE AND GET HER UNDRESSED
WELL THAT'S A LOT
FINALLY!!
TOO MUCH!! STHAP!
PUZZLE SOLVING OVERLOAD!
COMPLETE THE FINAL RIKA STAGE AND GET HER UNDRESSED
PUZZLE SOLVING SPREE!
SOLVED!
THERE YOU GO!
COMPLETE THE FINAL MIKO STAGE AND GET HER UNDRESSED
AND ANOTHER ONE!
ANOTHER ONE!
BLOCKS FITTED SOME PUZZLE PIECES!
THAT'S A LOT OF PUZZLES
FITTED SOME PUZZLE PIECES!
CLICK THE PUZZLE PIECES 1000 TIMES
3 TIMES CHEATED?
COMPLETE THE FINAL KYOKO STAGE AND GET HER UNDRESSED
LOOK HOW AWESOME I AM!
NICELY PACKED TOGETHER!
FITTED SOME PUZZLE PIECES TOGETHER!
CLICK THE PUZZLE PIECES 500 TIMES
COMPLETE THE FINAL HAICHI STAGE AND GET HER UNDRESSED
GOOD PROGRESS!!!
...AND THERE IS THE SECOND TIME
COMPLETE THE FINAL AKIKO STAGE AND GET HER UNDRESSED
CLICK THE PUZZLE PIECES 100 TIMES
THERE IS ALWAYS THE FIRST TIME!
GREAT START!