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 1 PUZZLE WITH NIKO
SOLVE 3 PUZZLES WITH SEDUCED COCO
SOLVE 4 PUZZLES WITH COCO
SOLVE 1 PUZZLE WITH SEDUCED COCO
COLLECT 37 ITEMS
SOLVE 35 PUZZLES
COLLECT 40 ITEMS
SOLVE 1 PUZZLE WITH COCO
SOLVE 1 PUZZLE WITH SEDUCED LULI
SOLVE 30 PUZZLES
SOLVE 4 PUZZLES WITH LULI
COLLECT 35 ITEMS
SOLVE 3 PUZZLES WITH SEDUCED LULI
SOLVE 25 PUZZLES
COLLECT 30 ITEMS
SOLVE 1 PUZZLE WITH LULI
SOLVE 20 PUZZLES
COLLECT 25 ITEMS
SOLVE 15 PUZZLES
VIEW 100 PHOTOS
VIEW 1 PHOTO
VIEW 10 PHOTOS
"FLARE" FIRED 15 TIMES
UNLOCKED "CHOCOLATE AIRSTRIKE" IN SKILL TREE
SOLVE 1000 BLOCKS
NEW_ACHIEVEMENT_DESC_1_25
SOLVE 900 BLOCKS
CLICK A PIECE WITH "SECRET PRESENT" 5 TIMES
GAIN 30000 EXPERIENCE
SOLVE 800 BLOCKS
"LOVE SPARKLE" FIRED 50 TIMES
UNLOCKED "SECRET PRESENT" IN SKI
LEVEL UP TO LEVEL 30
CLICK THE PUZZLE PIECES 1500 TIMES
SOLVE 700 BLOCKS
CLICK A PIECE WITH "SECRET PRESENT"
CLICK THE PUZZLE PIECES 1000 TIMES
LEVEL UP TO LEVEL 25
SOLVE 600 BLOCKS
CLICK THE PUZZLE PIECES 900 TIMES
UNLOCKED "FLASH BOMB" IN SKILL TREE
FIRE "EARTHQUAKE" 10 TIMES
SOLVE 10 PUZZLES
SOLVE 3 PUZZLES WITH SEDUCED SAYOURI
CLICK THE PUZZLE PIECES 800 TIMES
SOLVE 500 BLOCKS
FIRE "CHOCOLATE AIRSTRIKE" 30 TIMES
LEVELED 20 ABILITIES IN TOTAL
NEW_ACHIEVEMENT_DESC_1_24
LEVEL UP TO LEVEL 20
CLICK THE PUZZLE PIECES 700 TIMES
SOLVE 400 BLOCKS
SOLVE 4 PUZZLES WITH SAYOURI
CLICK THE PUZZLE PIECES 600 TIMES
UNLOCKED "EARTHQUAKE" IN SKILL TREE
LEVELED 15 ABILITIES IN TOTAL
GAIN 10000 EXPERIENCE
SOLVE 300 BLOCKS
SOLVE 1 PUZZLE WITH SEDUCED SAYOURI
GATHER 7 UNSPENT ABILITY POINTS
LEVEL UP TO LEVEL 15
CLICK THE PUZZLE PIECES 500 TIMES
CLICK THE PUZZLE PIECES 400 TIMES
"LOVE SPARKLE" FIRED 10 TIMES
SOLVE 200 BLOCKS
SOLVE 20 PIECES USING "FLIP ALMOST SOLVED"
LEVELED 10 ABILITIES IN TOTAL
GAIN 5000 EXPERIENCE
LEVEL UP TO LEVEL 10
CLICK THE PUZZLE PIECES 300 TIMES
SOLVE 5 PUZZLES
CLICK THE PUZZLE PIECES 200 TIMES
UNLOCKED "FLIP ALMOST SOLVED" IN SKILL TREE
UNLOCKED "FLARE" IN SKILL TREE
UNLOCKED "LOVE SPARKLE" IN SKILL TREE
NEW_ACHIEVEMENT_DESC_1_23
SOLVE 100 BLOCKS
CLICK THE PUZZLE PIECES 100 TIMES
SOLVE 50 BLOCKS
LEVELED 5 ABILITIES IN TOTAL
UNLOCKED "PEEK" IN SKILL TREE
NEW_ACHIEVEMENT_DESC_1_22
CLICK THE PUZZLE PIECES 50 TIMES
LEVEL UP TO LEVEL 5
NEW_ACHIEVEMENT_DESC_1_21
SOLVE 2 PUZZLES
COLLECT 2 ITEMS
COLLECT 1 ITEM
SOLVE 1 PUZZLE WITH SAYOURI
SOLVE 1 PUZZLE
SOLVE 10 BLOCKS
CLICK THE PUZZLE PIECES 10 TIMES
SOLVE 1 BLOCK
LEVEL UP TO LEVEL 2
CLICK THE PUZZLE PIECES 1 TIME
HELLO THERE!