This achievement is obtaned by getting a best weapon by Faintstones.
Weapon must be at level +6 to start upgrading by Faint stones.
Weapons must be strengthened by Faint stones up to a maximum of level 5.
Below are weapons that require the lowest ammount of ore to get final upgrade:
(Shard/Chunk/Pure) Faintstones required
short sword: Sold by Blacksmith Oldwin (20/7/1)
Best places to find Ores:
Faint shard: Dropped by Shaman depraved one in 5-2 Archstone
Chunk of Faintstone: Dropped by Shaman depraved one in 5-2 Archstone (Rare)
Pure Faintstone: Talk to Worshipper of God (Urbain's Female Follower) in the Nexus (requires 20 Faith)