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