Here is the full list of all 30 How To Date A Magical Girl achievements.
Start out life as a Liar
View Miyu's secret event
Complete Miyu's route
See the Mystery Ending
See the Happy Ending
See the Bad Ending
View Yui's secret event
Get an A grade in Magic
Get an A grade in all key attributes
Win a prize at the arcade
Complete Yui's route
Reject a girl's confession
Get an A grade in Expertise
Get an A grade in Alchemy
View Hikari's friendship event
View Kaori's friendship event
View Rei's friendship event
View Miyu's friendship event
Get an A grade in Perception
Play with Hoshi
View Yui's friendship event
Drink a potion
Finish reading 6 books
Give a gift to a girl
Complete Hikari's route
Complete Kaori's route
Complete Rei's route
View Hikari's secret event
View Kaori's secret event
View Rei's secret event