No missable achievements (plus 51 unknown)
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Have made an observation.
Have solved a riddle.
Have answered a question from the little grey cells.
Have completed an interrogation.
Have finished Andover.
Have read any newspaper.
Have told Japp about the second crime.
Have tidied up once.
Have solved half the riddles.
Have completed half of the interrogations.
Have made a mistake …
Have answered half of the questions from the little grey cells.
Have finished the Bexhill inquiry.
Have made half of the observations.
Have prepared to leave for Churston.
Have opened the secret cupboard of Sir Carmichael's secretary.
Have discussed porcelain with Thora Grey.
Have finished the first inquiry in Churston.
Have discovered Thora Grey's intentions.
Have successfully completed the meeting of suspects.
Have brought all the suspects to Whitehaven.
The viewpoint of a sick old lady has as much value as that of a pretty and young girl.
Have made yourself at home.
Have tidied up twice.
Have searched the entire Churston manor.
Have helped Donald Fraser to interpret his dream.
Have successfully completed Thora Grey's second interrogation
Have successfully compared all the murderer's letters.
Have answered all the questions from the little grey cells.
Have prevented the fourth crime.
Have solved all the riddles.
Have completed all the interrogations.
Have finished Cust's interrogation.
Have helped Lady Cust and A.B. Cust.
Have unmasked murderer!
Have finished the inquiry at Cust's.
Have opted for a non-violent end by choosing blank bullets.
Hare read a newspaper which criticises Poirot.
Have tidied up thrice.
Have made Mary Drower cry.
Have found all the black dragons in Churston.
Have read the last newspaper.
Have caused Donbar's heart attack over the telephone.
Have saved Donbar's life over the telephone.
Have made four mistakes …
Have taken care of your moustache in all the places with a mirror.
Have made all the observations.
Have accused Thora Grey of black magic.
Have made eight mistakes …