Here is the full list of all 100 Miss Neko 3 achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Touch neko in mainscreen
Knowledge of Siamese cat
Knowledge of Sphynx cat
Knowledge of Scottish Fold
Knowledge of Japanese Bobtail
Knowledge of Cornish Rex
Knowledge of Abyssinian cat
Knowledge of Turkish Angora
Knowledge of Exotic Shorthair
Unlock all of the cats
Neko...change!
Get all stars in level 35
Get all stars in Neko City#96572
Get all stars in level 34
Get all stars in level 33
Get all stars in level 32
Get all stars in level 31
Get all stars in level 30
Get all stars in level 28
Get all stars in level 15
Get all stars in level 21
Get all stars in level 13
Get all stars in level 40
Get two stars in level 40
Get two stars in level 39
Get all stars in level 39
Get all stars in level 38
Get two stars in level 38
Get two stars in level 37
Get all stars in level 37
Get all stars in level 36
Get two stars in level 36
Get two stars in level 35
Get two stars in level 34
Get two stars in level 33
Get two stars in level 32
Get two stars in level 31
Get two stars in level 30
Get all stars in level 29
Get two stars in level 29
Get two stars in level 28
Get all stars in level 27
Get two stars in level 27
Get all stars in level 26
Get two stars in level 26
Get all stars in level 25
Get two stars in level 25
Get two stars in level 24
Get all stars in level 24
Get two stars in level 23
Get all stars in level 23
Get all stars in level 22
Get two stars in level 22
Get two stars in level 21
Get all stars in level 20
Get two stars in level 20
Get two stars in level 19
Get all stars in level 19
Get all stars in level 18
Get two stars in level 18
Get two stars in level 17
Get all stars in level 17
Get all stars in level 16
Get two stars in level 16
Get two stars in level 15
Get two stars in level 14
Get all stars in level 14
Get two stars in level 13
Get two stars in level 12
Get all stars in level 12
Get all stars in level 11
Get two stars in level 11
Get two stars in level 10
Get all stars in level 10
Get all stars in level 9
Get two stars in level 9
Get all stars in level 8
Get two stars in level 8
Get two stars in level 7
Get all stars in level 7
Get two stars in level 6
Get all stars in level 6
Get two stars in level 5
Get all stars in level 5
Get two stars in level 4
Get all stars in level 4
Get all stars in level 3
Get two stars in level 3
Get all stars in level 2
Get two stars in level 2
Get all stars in level 1
Get two stars in level 1
Welcome to Neko City#96572