Here is the full list of all 37 Himegimi Detective achievements.
Episode 1 Ending: Major Debut unlocked
Episode 1 Ending: Too Little, Too Late unlocked
Episode 1 Ending: Too Much, Too Soon unlocked
Episode 1 Ending: Suicide After All unlocked
Episode 1 Ending: A Disappointing Detective unlocked
Episode 1 Cleared
Episode 2 Ending: A Prank, Perhaps... unlocked
Episode 2 Ending: Unwelcome Interference unlocked
Episode 2 Ending: Shut Tight unlocked
Episode 2 Ending: Round and Round unlocked
Episode 2 Ending: Beginner's Luck unlocked
Episode 2 Ending: A Story Full of Holes unlocked
Episode 2 Cleared (Secret Ending)
Episode 2 Cleared
Episode 3 Ending: A Detective's Pride unlocked
Episode 3 Ending: First Defeat unlocked
Episode 3 Ending: Without a Trace unlocked
Episode 3 Ending: Declaration of Retirement unlocked
Episode 3 Ending: Amatsukami Escapes unlocked
Episode 3 Ending: A Butler's Best unlocked
Episode 3 Ending: Back to Basics unlocked
Episode 3 Cleared
Episode 4 Ending: Games are for Children unlocked
Episode 4 Ending: Not a Word unlocked
Episode 4 Ending: Bested by the Best unlocked
Episode 4 Ending: No Follow Through unlocked
Episode 4 Ending: Forever Second Best unlocked
Episode 4 Cleared
Episode 5 Ending: Not Good Enough unlocked
Episode 5 Ending: A Poor Assistant unlocked
Episode 5 Ending: Out of the Loop unlocked
Episode 5 Ending: Darkness unlocked
Episode 5 Ending: An Inglorious Shame unlocked
Episode 5 Ending: Mercifully Spared unlocked
Episode 5 Ending: A Great Debt unlocked
Episode 5 Cleared
Episode 5 Cleared (True Ending)