Here is the full list of all 100 Mosaique Neko Waifus 2 achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
VIEW 100 PHOTOS
SOLVE ALL CHEN AND SUYIN PUZZLE
ALL GIRLS JUMP OUT OF THEIR CLOTHES
SOLVE FIRST CHEN AND SUYIN PUZZLE
SOLVE ALL SARA AND SAYOURI PUZZLES
FINISH SARA AND SAYOURI EXTRA PUZZLE
SOLVE FIRST SARA AND SAYOURI PUZZLE
FIRE "EARTHQUAKE" 10 TIMES
SOLVE ALL CHEN PUZZLES
SOLVE FIRST CHEN PUZZLE
SOLVE ALL SAYOURI PUZZLES
SOLVE 40 PUZZLES
COLLECT 40 ITEMS
SOLVE FIRST SAYOURI PUZZLE
SOLVE 35 PUZZLES
COLLECT 35 ITEMS
SOLVE ALL NIKO PUZZLES
SOLVE 1000 BLOCKS
SOLVE 30 PUZZLES
GAIN 30000 EXPERIENCE
SOLVE 900 BLOCKS
COLLECT 30 ITEMS
SOLVE 800 BLOCKS
UNLOCKED "FLASH BOMB" IN SKILL TREE
LEVEL UP TO LEVEL 30
UNLOCKED "EARTHQUAKE" IN SKILL TREE
UNLOCKED "LOVE SPARKLE" IN SKILL TREE
SOLVE 700 BLOCKS
SOLVE 25 PUZZLES
GATHER 7 UNSPENT ABILITY POINTS
LEVEL UP TO LEVEL 25
CLICK THE PUZZLE PIECES 1000 TIMES
GATHER 5 UNSPENT ABILITY POINTS
FIRE "CHOCOLATE AIRSTRIKE" 30 TIMES
SOLVE 600 BLOCKS
CLICK THE PUZZLE PIECES 900 TIMES
COLLECT 25 ITEMS
LEVELED 20 ABILITIES IN TOTAL
SOLVE 20 PIECES USING "FLIP ALMOST SOLVED"
LEVEL UP TO LEVEL 20
CLICK THE PUZZLE PIECES 800 TIMES
SOLVE 500 BLOCKS
SOLVE 20 PUZZLES
"LOVE SPARKLE" FIRED 50 TIMES
COLLECT 20 ITEMS
CLICK A PIECE WITH "SECRET PRESENT" 5 TIMES
CLICK THE PUZZLE PIECES 700 TIMES
SOLVE 400 BLOCKS
SOLVE 15 PUZZLES
UNLOCKED "SECRET PRESENT" IN SKI
COLLECT 15 ITEMS
CLICK THE PUZZLE PIECES 600 TIMES
LEVELED 15 ABILITIES IN TOTAL
FINISH NIKO EXTRA PUZZLE
GAIN 10000 EXPERIENCE
LEVEL UP TO LEVEL 15
SOLVE 300 BLOCKS
CLICK THE PUZZLE PIECES 500 TIMES
SOLVE 10 PUZZLES
"FLARE" FIRED 15 TIMES
COLLECT 10 ITEMS
CLICK A PIECE WITH "SECRET PRESENT"
SOLVE FIRST NIKO PUZZLE
VIEW 2 PHOTOS
VIEW 1 PHOTO
SOLVE ALL SARA PUZZLES
SOLVE 200 BLOCKS
CLICK THE PUZZLE PIECES 400 TIMES
LEVELED 10 ABILITIES IN TOTAL
GAIN 5000 EXPERIENCE
LEVEL UP TO LEVEL 10
CLICK THE PUZZLE PIECES 300 TIMES
CLICK THE PUZZLE PIECES 200 TIMES
SOLVE 100 BLOCKS
UNLOCKED "FLIP ALMOST SOLVED" IN SKILL TREE
SOLVE 5 PUZZLES
GATHER 2 UNSPENT ABILITY POINTS
"LOVE SPARKLE" FIRED 10 TIMES
SOLVE 50 BLOCKS
CLICK THE PUZZLE PIECES 100 TIMES
COLLECT 4 ITEMS
COLLECT 5 ITEMS
LEVELED 5 ABILITIES IN TOTAL
UNLOCKED "CHOCOLATE AIRSTRIKE" IN SKILL TREE
COLLECT 3 ITEMS
LEVEL UP TO LEVEL 5
CLICK THE PUZZLE PIECES 50 TIMES
COLLECT 2 ITEMS
SOLVE 2 PUZZLES
SOLVE 10 BLOCKS
UNLOCKED "PEEK" IN SKILL TREE
COLLECT 1 ITEM
SOLVE 1 PUZZLE
CLICK THE PUZZLE PIECES 10 TIMES
SOLVE FIRST PUZZLE WITH SARA
UNLOCKED "FLARE" IN SKILL TREE
LEVEL UP TO LEVEL 2
SOLVE 1 BLOCK
CLICK THE PUZZLE PIECES FOR THE FIRST TIME
HELLO THERE!