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