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