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.
PEEKER!
WELL THAT'S A LOT
COMPLETE THE FINAL MICHIKO & KAORI STAGE AND GET HER UNDRESSED
COMPLETE THE FINAL NATSUMI STAGE AND GET HER UNDRESSED
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!
THAT'S A LOT OF PUZZLES
BLOCKS FITTED SOME PUZZLE PIECES!
COMPLETE THE FINAL KYOKO STAGE AND GET HER UNDRESSED
FITTED SOME PUZZLE PIECES!
CLICK THE PUZZLE PIECES 1000 TIMES
NICELY PACKED TOGETHER!
LOOK HOW AWESOME I AM!
FITTED SOME PUZZLE PIECES TOGETHER!
COMPLETE THE FINAL HAICHI STAGE AND GET HER UNDRESSED
GOOD PROGRESS!!!
3 TIMES CHEATED?
CLICK THE PUZZLE PIECES 500 TIMES
...AND THERE IS THE SECOND TIME
COMPLETE THE FINAL AKIKO STAGE AND GET HER UNDRESSED
THERE IS ALWAYS THE FIRST TIME!
CLICK THE PUZZLE PIECES 100 TIMES
GREAT START!