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 3 PUZZLES WITH SEDUCED NIKO
SOLVE 4 PUZZLES WITH NIKO
SOLVE 1 PUZZLE WITH SEDUCED NIKO
ALL GIRLS JUMP OUT OF THEIR CLOTHES
SOLVE 35 PUZZLES
SOLVE 1 PUZZLE WITH NIKO
SOLVE 1 PUZZLE WITH SEDUCED LULI
GAIN 30000 EXPERIENCE
SOLVE 30 PUZZLES
LEVEL UP TO LEVEL 30
SOLVE 4 PUZZLES WITH LULI
SOLVE 3 PUZZLES WITH SEDUCED LULI
SOLVE 25 PUZZLES
SOLVE 4 PUZZLES WITH COCO
LEVEL UP TO LEVEL 25
SOLVE 3 PUZZLES WITH SEDUCED COCO
LEVELED 20 ABILITIES IN TOTAL
LEVEL UP TO LEVEL 20
SOLVE 20 PUZZLES
SOLVE 1 PUZZLE WITH SEDUCED COCO
GAIN 10000 EXPERIENCE
LEVELED 15 ABILITIES IN TOTAL
SOLVE 15 PUZZLES
SOLVE 1 PUZZLE WITH COCO
LEVEL UP TO LEVEL 15
SOLVE 1 PUZZLE WITH LULI
SOLVE 10 PUZZLES
SOLVE 3 PUZZLES WITH SEDUCED SAYOURI
LEVELED 10 ABILITIES IN TOTAL
GAIN 5000 EXPERIENCE
SOLVE 4 PUZZLES WITH SAYOURI
LEVEL UP TO LEVEL 10
SOLVE 1 PUZZLE WITH SEDUCED SAYOURI
GATHER 7 UNSPENT ABILITY POINTS
SOLVE 5 PUZZLES
LEVEL UP TO LEVEL 5
LEVELED 5 ABILITIES IN TOTAL
SOLVE 2 PUZZLES
UNLOCKED "SECRET PRESENT" IN SKI
UNLOCKED "FLASH BOMB" IN SKILL TREE
UNLOCKED "CHOCOLATE AIRSTRIKE" IN SKILL TREE
UNLOCKED "FLIP ALMOST SOLVED" IN SKILL TREE
UNLOCKED "LOVE SPARKLE" IN SKILL TREE
UNLOCKED "EARTHQUAKE" IN SKILL TREE
UNLOCKED "FLARE" IN SKILL TREE
UNLOCKED "PEEK" 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
"FLARE" FIRED 15 TIMES
FIRE "CHOCOLATE AIRSTRIKE" 30 TIMES
VIEW 10 PHOTOS
VIEW 100 PHOTOS
VIEW 1 PHOTO
FIRE "EARTHQUAKE" 10 TIMES
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
SOLVE 1 BLOCK
CLICK THE PUZZLE PIECES 1 TIME
CLICK THE PUZZLE PIECES 10 TIMES
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
COLLECT 1 ITEM
COLLECT 2 ITEMS
NEW_ACHIEVEMENT_DESC_1_21
NEW_ACHIEVEMENT_DESC_1_22
NEW_ACHIEVEMENT_DESC_1_23
NEW_ACHIEVEMENT_DESC_1_24
NEW_ACHIEVEMENT_DESC_1_25
COLLECT 25 ITEMS
COLLECT 30 ITEMS
COLLECT 35 ITEMS
COLLECT 40 ITEMS
COLLECT 37 ITEMS
SOLVE 1 PUZZLE
SOLVE 1 PUZZLE WITH SAYOURI
LEVEL UP TO LEVEL 2
HELLO THERE!