Here is the full list of all 14 Code of Princess EX achievements.
Completed the tutorial
Unlocked the shop
Bought all items in the shop.
Cleared the scenario with Solange
Cleared the scenario with Ali
Cleared the scenario with Lady Zozo
Cleared the scenario with Allegro
Cleared 100 quests
Cleared 500 Quests
Cleared 1000 quests
Cleared all quests
Retrieved all items
Unlocked every character
Unlocked every achievements