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