Here is the full list of all 50 Agatha Christie - there are The ABC Murders achievements worth 1,000 gamerscore.
Have opted for a non-violent end by choosing blank bullets.
Have read the last newspaper.
Have made all the observations.
Have saved Donbar's life over the telephone.
Have accused Thora Grey of black magic.
Have tidied up thrice.
Have tidied up twice.
Have unmasked murderer!
Have made eight mistakes …
Have taken care of your moustache in all the places with a mirror.
Have finished Cust's interrogation.
Have helped Lady Cust and A.B. Cust.
Have completed all the interrogations.
Have finished the inquiry at Cust's.
Have solved all the riddles.
Have prevented the fourth crime.
Have caused Donbar's heart attack over the telephone.
Have answered all the questions from the little grey cells.
Have successfully compared all the murderer's letters.
Have successfully completed Thora Grey's second interrogation
Have helped Donald Fraser to interpret his dream.
Hare read a newspaper which criticises Poirot.
Have finished searching the Churston mansion.
Have tidied up once.
Have searched the entire Churston manor.
Have found all the black dragons in Churston.
The viewpoint of a sick old lady has as much value as that of a pretty and young girl.
Have brought all the suspects to Whitehaven.
Have successfully completed the meeting of suspects.
Have finished the first inquiry in Churston.
Have discovered Thora Grey's intentions.
Have made four mistakes …
Have discussed porcelain with Thora Grey.
Have opened the secret cupboard of Sir Carmichael's secretary.
Have prepared to leave for Churston.
Have finished the Bexhill inquiry.
Have answered half of the questions from the little grey cells.
Have completed half of the interrogations.
Have made half of the observations.
Have solved half the riddles.
Have told Japp about the second crime.
Have made yourself at home.
Have read any newspaper.
Have finished Andover.
Have made a mistake …
Have made Mary Drower cry.
Have completed an interrogation.
Have answered a question from the little grey cells.
Have solved a riddle.
Have made an observation.