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