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