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