Here is the full list of all 39 Gal*Gun: Double Peace achievements.
View the True Love Route's True Ending
View All of the True Endings
View Patako's True Ending
View Kurona's True Ending
Defeat 100 Demon Girls
View Ekoro's True Ending
Receive a “Perfect!” Score VS Mr. Demon Balloon
Collect All of the Panties From the Changing Room
View Sisters Route's True Ending
Get a Perfect Score on “Demon-Attracting Balm”
View Aoi's Ending
Get a Perfect Score on “Sisters' Odd Ritual”
Achieve Godlike Rank
View Maya's True Ending
Get a Perfect Score on “Maya's Medical Care”
View Shinobu's True Ending
Get a Perfect Score on “Her Majesty Shinobu”
Get a Perfect Score on “Shinobu in the Window”
Get a 30 Combo of Ecstasy Shots
View Your First Ending
Experience Your First Final Doki-Doki Mode
Give 500 Girls Euphoria
Fulfill 10 of the Girls' Requests
Fire 1000 Pheromone Shots
Get a Perfect Score on “Maya's Demon Calling”
Get 100 Ecstasy Shots
Experience Your First Doki-Doki Mode
Give a Girl Euphoria
Unlock All Trophies
Receive a “Perfect!” Score VS Shinobu
Receive a “Perfect!” Score VS Maya
Receive a “Perfect!” Score VS Shinobu & Maya
Receive a “Perfect!” Score VS Ekoro
Receive a “Perfect!” Score VS Kurona
Receive a “Perfect!” Score VS Patako
Receive a “Perfect!” Score VS Mr. Demon Veggie
Make 50+ Girls Experience “Double Peace”
Obtain All Images in the Gallery
Complete Profiles for Every Girl