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