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