Here is the full list of all 10 Sherlock Holmes Consulting Detective: The Case of the Tin Soldier achievements.
Solved the Mystery You solved the Case of the Tin Soldier
You solved the mystery under 400 points.
You found all the clues required to solve the mystery!
You found a key clue!
Started the Mystery.
You solved the mystery better than Holmes himself!
Well Done! You solved the mystery under 120 points.