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