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