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