Here is the full list of all 18 Story of Eve - A Hero's Study achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Play the second Blush Event
Find the hidden button in the final boss fight
Watch the whole staff list patiently
Defeated by the Tentacles. Ran out of EP
Play the third Blush Event
Defeated by the Succubus. Ran out of EP
Defeated by the Imperial Guards. Ran out of EP
Completed the Final Sacred Suit
Defeated by the Orc King. Ran out of EP
Defeated by the Goblin King. Ran out of EP
Completed the Heroine's Bikini
Completed the Magical Girl Outfit
Defeated by the Slime King. Ran out of EP
Play the first Blush Event
Completed the Advanced Outfit
Searched the Slime King on the Plains
Frist Save
Found materials for the Sacred Suit, Completed Tutorial