Here is the full list of all 41 Lamplight City achievements.
Eavesdropped on every conversation
Accused Albert Martin of Madame DuPrée's attempted murder
Correctly solved every case
Played through the entire game without opening the casebook
Checked yourself into Riverview Asylum
Accused Guy Dumas of Madame DuPrée's attempted murder
Accused Juliette Montgomery of Madame DuPrée's attempted murder
Every friendship has one
Found every single clue and document in the game
Ended up in jail
Sang a popular drinking song
Told Patrick a story
Accused Roger DeVay of murdering Desiree Lathan
Gave Charlotte Robineaux a music lesson
Showed Desiree's ashes to someone who wasn't Dr. Edwards
Tricked Jonas Usher
Revealed Madame DuPrée's true nature
Kept your promise to Mrs. Hanbrook
Concluded that Desiree Lathan's death was due to spontaneous human combustion
Learned about Mrs. Davis's hobby
Fixed the boiler without any help
Accused Jimbo of murdering Ronan L'Espaye
Accused Malcolm Harris of kidnapping his own son
Accuse Arthur Devins of kidnapping the Harris baby
Completed the game
Confronted the Justice Killer in his own home
Told Adelaide the truth
Accused Tom Puffin of murdering Ronan L'Espaye
Discovered the truth about the cooping scheme
Read every book in the game
You voted!
Accused Margaret Andrews of murdering Desiree Lathan
Successfully located Linda Walker
Accuse Linda Walker of kidnapping the Harris baby
Told Angela Maxwell about your problems
Spoke with Roland Deveraux
Declared a case unsolvable
Played a familiar melody
Got kicked out of Sabine Martin's apartment
Read Madame DuPrée's poems
You're so annoying