Here is the full list of all 37 Gal*Gun 2 (EU) trophies - there are 18 bronze, 14 silver, 4 gold and 1 platinum.
Unlock every trophy.
Get kissed by 50 girls.
Call a girl over to your house for the first time.
Get stepped on by 50 girls.
Get every girls' phone number.
Reach Risu's good ending.
Finish Nanako's route A.
Finish Nanako's route B.
Upgrade your Pheromone Goggles to their final form.
Finish Chiru's route B.
Reach the Harem ending.
Have plenty of conversations with Chiru.
Upgrade your Demon Sweeper to its final form.
Finish Chiru's route A.
Reach the ending for the first time.
Have plenty of conversations with Nanako.
Clear all of the Kamizono Sisters' requests.
Clear your first search mission.
Clear your first Doki Dokie Mode.
Give 30 girls Striphoria.
Give 500 girls euphoria.
Get stepped on by 10 girls.
Get kissed by 10 girls.
Use the Demon Sweeper to give a girl Striphoria for the first time.
Suck up 500 mini-demons.
Take a good look from below when you have a girl over.
Give 50 girls euphoria with Lovestrikes.
Suck up a Metal Kurona for the first time.
Clear your first defense mission.
Suck up 100 mini-demons.
Give a girl a snack for the first time.
Give 100 girls euphoria.
Perform a Lovestrike for the first time.
Get 50 ecstacy shots in a row.
Get 30 ecstacy shots in a row.
Clear your first regular mission.
Get an ecstacy shot for the first time.