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