Here is the full list of all 35 Lovecraft's Untold Stories achievements worth 1,000 gamerscore.
Complete the story of the Detective
Complete the story of the Professor
Complete the story of the Witch
Complete the story of the Thief
Complete the story of the Ghoul
Unlock the Professor
Unlock the Witch
Unlock the Thief
Unlock the Ghoul
Defeat Dagon
Defeat Cthulhu
Defeat Shub Niggurath
Defeat Niarlathotep
Defeat Azathoth
At least 1 time to drive any character crazy
At least 1 time to drive all the characters crazy
Complete any Great Old One without collecting 100% information about him
Collect 100% of the information on one of the Great Old One
Collect 100% of the information on all the Great Old Ones
Complete all side quests
Find 75% of mini event stories
Find all of mini event stories.
Spend 100,000 gold and 100,000 information in stores
Pass on the most difficult level the story of any character
Pass on the most difficult level the story of all the characters
Find things not from this world
To see what was impossible to see
Suicide in a strange place
Do not use the services of shops, expelling them, go through the story of the character
Defeat all the Great Old Ones with the same character.
Find secret room without Detective
Eat 100 chocolate bar
Save the Earth from all Great Old Ones
Complete the story of any character without receiving any the curses
Get simultaneously 5 curses of the Great Old Ones