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