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