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