Here is the full list of all 100 Mosaique Neko Waifus 3 achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
SOLVE 4 PUZZLES WITH SAYOURI
UNLOCKED "FLIP ALMOST SOLVED" IN SKILL TREE
UNLOCKED "CHOCOLATE AIRSTRIKE" IN SKILL TREE
UNLOCKED "FLASH BOMB" IN SKILL TREE
UNLOCKED "SECRET PRESENT" IN SKI
UNLOCKED "PEEK" IN SKILL TREE
UNLOCKED "FLARE" IN SKILL TREE
UNLOCKED "EARTHQUAKE" IN SKILL TREE
UNLOCKED "LOVE SPARKLE" IN SKILL TREE
SOLVE 20 PIECES USING "FLIP ALMOST SOLVED"
CLICK A PIECE WITH "SECRET PRESENT"
CLICK A PIECE WITH "SECRET PRESENT" 5 TIMES
"LOVE SPARKLE" FIRED 50 TIMES
"LOVE SPARKLE" FIRED 10 TIMES
FIRE "CHOCOLATE AIRSTRIKE" 30 TIMES
"FLARE" FIRED 15 TIMES
VIEW 10 PHOTOS
VIEW 100 PHOTOS
VIEW 1 PHOTO
FIRE "EARTHQUAKE" 10 TIMES
SOLVE 1 BLOCK
SOLVE 10 BLOCKS
SOLVE 50 BLOCKS
SOLVE 100 BLOCKS
SOLVE 200 BLOCKS
SOLVE 300 BLOCKS
SOLVE 400 BLOCKS
SOLVE 500 BLOCKS
SOLVE 600 BLOCKS
SOLVE 700 BLOCKS
SOLVE 800 BLOCKS
SOLVE 900 BLOCKS
SOLVE 1000 BLOCKS
CLICK THE PUZZLE PIECES 50 TIMES
CLICK THE PUZZLE PIECES 100 TIMES
CLICK THE PUZZLE PIECES 200 TIMES
CLICK THE PUZZLE PIECES 300 TIMES
CLICK THE PUZZLE PIECES 400 TIMES
CLICK THE PUZZLE PIECES 500 TIMES
CLICK THE PUZZLE PIECES 600 TIMES
CLICK THE PUZZLE PIECES 700 TIMES
CLICK THE PUZZLE PIECES 800 TIMES
CLICK THE PUZZLE PIECES 900 TIMES
CLICK THE PUZZLE PIECES 1000 TIMES
CLICK THE PUZZLE PIECES 1500 TIMES
CLICK THE PUZZLE PIECES 10 TIMES
COLLECT 37 ITEMS
SOLVE 4 PUZZLES WITH NIKO
CLICK THE PUZZLE PIECES 1 TIME
COLLECT 40 ITEMS
SOLVE 3 PUZZLES WITH SEDUCED NIKO
GAIN 30000 EXPERIENCE
SOLVE 1 PUZZLE WITH SEDUCED NIKO
SOLVE 35 PUZZLES
ALL GIRLS JUMP OUT OF THEIR CLOTHES
COLLECT 35 ITEMS
LEVEL UP TO LEVEL 30
SOLVE 1 PUZZLE WITH NIKO
SOLVE 30 PUZZLES
SOLVE 4 PUZZLES WITH LULI
COLLECT 30 ITEMS
SOLVE 1 PUZZLE WITH SEDUCED LULI
LEVEL UP TO LEVEL 25
SOLVE 3 PUZZLES WITH SEDUCED LULI
SOLVE 25 PUZZLES
SOLVE 4 PUZZLES WITH COCO
LEVELED 20 ABILITIES IN TOTAL
COLLECT 25 ITEMS
LEVEL UP TO LEVEL 20
SOLVE 3 PUZZLES WITH SEDUCED COCO
LEVELED 15 ABILITIES IN TOTAL
SOLVE 20 PUZZLES
GAIN 10000 EXPERIENCE
SOLVE 1 PUZZLE WITH SEDUCED COCO
LEVEL UP TO LEVEL 15
NEW_ACHIEVEMENT_DESC_1_25
SOLVE 15 PUZZLES
SOLVE 1 PUZZLE WITH COCO
SOLVE 3 PUZZLES WITH SEDUCED SAYOURI
NEW_ACHIEVEMENT_DESC_1_24
LEVELED 10 ABILITIES IN TOTAL
GAIN 5000 EXPERIENCE
SOLVE 1 PUZZLE WITH SEDUCED SAYOURI
LEVEL UP TO LEVEL 10
SOLVE 10 PUZZLES
GATHER 7 UNSPENT ABILITY POINTS
LEVELED 5 ABILITIES IN TOTAL
SOLVE 5 PUZZLES
NEW_ACHIEVEMENT_DESC_1_23
SOLVE 1 PUZZLE WITH LULI
NEW_ACHIEVEMENT_DESC_1_22
LEVEL UP TO LEVEL 5
NEW_ACHIEVEMENT_DESC_1_21
SOLVE 2 PUZZLES
COLLECT 1 ITEM
COLLECT 2 ITEMS
SOLVE 1 PUZZLE
SOLVE 1 PUZZLE WITH SAYOURI
LEVEL UP TO LEVEL 2
HELLO THERE!