Here is the full list of all 69 DEEP SPACE WAIFU: FANTASY achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
COMPLETE ONE HAND ABYSSAL
COMPLETE ONE HAND RYA
COMPLETE ONE HAND MODE JELLY
COMPLETE ONE HAND AUGEMEISTER
COMPLETE ONE HAND SONJA
COMPLETE ONE HAND MODE OROCHI
COMPLETE ONE HAND MODE CARSSIA
COMPLETE ONE HAND TIA SOFTHAND
COMPLETE ONE HAND OPHELIA
COMPLETE ONE HAND MODE TRICCIA
COMPLETE ONE HAND MODE RENA
SEE THE CREDITS!
100% AUGEMEISTER
DESTROY THE ANGEL MINIBOSS
DEFEAT THE MOAI ANGEL
100% OPHELIA
DEFEAT ASMODEUS
100% TRICCIA
YOU ENTERED GALLERY MODE
RESCUE THE PRINCESS FIERNA
EXPLORE ALL OF THE HENTALIA CONTINENT
UNLOCK THE DRAGON
REACH STAR LEVEL 35
DEFEAT SATAN
100% METAL ABYSSAL
UNLOCK THE EXTRA POWER UP SLOT
UNLOCK THE BANDANA
UNLOCK THE PROTECTIVE HELMET
UNLOCK THE FILLED SPECIAL BAR
UNLOCK THE SWORD ABILITY
UNLOCK THE EXTRA SHOOTING POWER
UNLOCK AUGEMEISTER
UNLOCK TRICCIA
UNLOCK THE UNICORN
SKIP ONE OF OUR EMOTIONAL CUTSCENES
DEFEATS TENTACLE MOON
100% OROCHI THE NAGA
FIND THE CLITORIUS
100% SONJA DRAGONTOOTH
DEFEAT BRAINHOLDER
UNLOCK SONJA DRAGONTOOTH
REACH STAR LEVEL 25
DEFEAT THE KNIGHT SKULL
100% TIA SOFTHAND
DESTROY THE DEVIL MINIBOSS
UNLOCK OPHELIA
DEFEAT THE UGLY FAERIES
100% NORMAL RYA TUTORIALICCA
REACH STAR LEVEL 15
UNLOCK NORMAL RYA TUTORIALICCA
UNLOCK TIA SOFTHAND
REACH STAR LEVEL 10
DEFEAT THE SLIME SUB BOSS
100% JELLY-CHAN
FIND A RANDOM ENCOUNTER
UNLOCK METAL ABYSSAL
100% CARSSIA BORGOTH
DEFEAT VIKING
UNLOCK OROCHI THE NAGA
GET 5 STARS IN ONE STAGE
TAKE A PICTURE OF A GIRL IN MIDDLE AGES
DEFEAT THE DEVILANGEL SUB BOSS
REACH STAR LEVEL 5
100% RENA GREENLEAF
EXPLODE A PIECE OF CLOTH
YOU DIED IN A DATE
HAVE YOUR FIRST DATE
PRESS START
UNLOCK CARSSIA BORGOTH