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