Visit the grave of a fallen hero while wearing the Black Metal Threads.

First of all you must finish the game.
Then change your clothes and put on the Black Metal Threads, then from Bladehenge go directly to the south exit, near you'll find the cemetery.
Go inside and at the end you'll see Lita and the grave of... someone.

Pray for him and get the Achievement.

P.S. (RATE and LIKE, guys)