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.
Defeated by the Tentacles. Ran out of EP
Watch the whole staff list patiently
Find the hidden button in the final boss fight
Play the second Blush Event
Defeated by the Succubus. Ran out of EP
Play the third Blush Event
Defeated by the Imperial Guards. Ran out of EP
Completed the Final Sacred Suit
Completed the Heroine's Bikini
Defeated by the Orc King. Ran out of EP
Completed the Magical Girl Outfit
Defeated by the Goblin King. Ran out of EP
Completed the Advanced Outfit
Defeated by the Slime King. Ran out of EP
Frist Save
Play the first Blush Event
Searched the Slime King on the Plains
Found materials for the Sacred Suit, Completed Tutorial