Here is the full list of all 46 Detective From The Crypt achievements.
Listen the audio record
Find all the pearls
Open all safes
Make Aunt Drink
Get sleeping pills from the doctor
Open the governess version
Open the version with Lord Darkday
Open Lady Darkday version
Open the Butler version
Open version with Aunt Esther
Help Mrs Brown
Help Mrs. Jones
Return the necklace to its owner
Learn the secret of the automaton
Find a use of the figurine
Find the use of soap bubbles
Find out whose button it is
Unlock all versions of events
Scare the butler to death
Help a kind mummy
Help the cat mummy
Help the loser
Find grandfather's diary
Discover the secret of the library
Help the bagpiper
Put the poison into hot chocolate
Find the pocket mirror
Get the second letter
Get a letter from your great-grandmother
Find the poacher
Find the use of the dung-beetle
Find a pocket watch
Help the Maid
Find the rat
Meet the Greedy Bride
Find Anubis Mask
Open the Sarcophagus
Find Pulcheria
Find family jewels
Find the diary
Find Opals
Find the shackles
Test Substances for Poison
Take a blood test
Apply magnifier to boots
Apply the magnifying glass on the monument