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