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