Here is the full list of all 69 DEEP SPACE WAIFU: NEKOMIMI achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
GET THE FURBALL SPECIAL
GET THE CATNIP SPECIAL
COMPLETE ONE HAND DIGINEKO
PLAY WITH JOE
FIND THE ULTIMATE RIVAL
DEFEAT SENIOR PICKLES
100% DIGINEKO
COMPLETE ONE HAND HOMELESS CATS
COMPLETE ONE HAND JENNY
DEFEAT THE CUTIE GANG
100% HOMELESS CATS
DEFEAT DEADNIP
100% JENNY RAZORHEELS
COMPLETE ONE HAND LADY
DEFEAT UPGRADED CATRON
100% NORMAL LADY WHITESTROKE
COMPLETE ONE HAND MARY
DEFEAT THE FURBALL
100% MARY KATTY
COMPLETE ONE HAND TIFFANY
UNLOCK THE DIGINEKO
REACH STAR LEVEL 30
DEFEAT THE CATRON BOSS
100% TIFFANY RANCHO
COMPLETE ONE HAND MODE TABATHA
UNLOCK JENNY RAZORHEELS
DEFEAT THE PUFF
100% TABATHA WOLFANG
REACH STAR LEVEL 20
COMPLETE ONE HAND MODE KUMA
UNLOCK HOMELESS CATS
UNLOCK MARY KATTY
DEFEATS CAT TOY
100% KUMA LUMA
COMPLETE ONE HAND MODE SHADOW
YOU DIED IN A DATE
UNLOCK NORMAL LADY WHITESTROKE
REACH STAR LEVEL 15
UNLOCK TIFFANY RANCHO
100% SHADOW MOON
DEFEAT PUMPKIN
COMPLETE ONE HAND MODE NEKOS
REACH STAR LEVEL 10
SKIP ONE OF OUR COMICS STYLED CUTSCENES
100% DOUBLE NEKOS
DEFEAT THE CATNIP BOSS
PICK THE LASER POWER UP
PICK THE RAY POWER UP
SEE THE CREDITS!
YOU ENTERED GALLERY MODE
COMPLETE ONE HAND MODE NORIKO
DESTROY THE MOTHERNIP MINIBOSS
UNLOCK KUMA LUMA
GET A PERFECT 5 HEARTS SCORE
UNLOCK SHADOW MOON
TAKE A PICTURE OF A LOST NEKO
DEFEAT NEKO BELL
100% MIMI-CHAN
PLAY WITH LEISURE LION
PLAY WITH FOXXXY
PICK THE GUN POWER UP
PICK THE MISSILE POWER UP
DESTROY THE X-NIP MINIBOSS
PICK THE SHIELD POWER UP
EXPLODE A PIECE OF CLOTH
PLAY WITH BEAR KING
HAVE YOUR FIRST DATE
PRESS START
UNLOCK TABATHA WOLFANG