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