To create a Enchanted Weapon you need to begin with a standard weapon ( one that you can appply pine resin to otherwise it is unique and will not work )
Then you will need to recover Enchanted Ember which is located in the Darkroot Garden (This is located in a chest in the middle of a very large Puddle of water in an area with the tall and small mushroom men walking around) and give this item to Rickert of Vinheim who is located in New Londo Ruins. This allows you access to the Enchanted branch of weapons which he can then upgrade to +5 Enchanted.
In order to complete the Enchanted weapon from scratch you will ultimately require 9 Titanite shards , 9 Large Green Titanite shards , 8 Blue Titanite Chunks and 1 Blue Titanite Slab
Blue Titanite Chunks-Crystal Golems and Crystal Lizards (recommended to wear fog ring against lizards) inside the Crystal Cave, However the best place to farm chunks of all kinds is at the end of the game int he Kiln of the First Flame ...all black knights have a 100% chunk drop rate and are respawnable.
BlueTitanite Slab - Can be found in Crystal Cave by traversing the invisible walkway after the Crystal Lizards(See vid for actual location of walkways, the key is to watch where the snowflakes fall because they only fall over the walkways). Bring lots of Prism Stone.
Here is a Chart which was created by an unknown so credit to whoever they are.
TRICK-To get the achievement without using your items simply fully upgrade the item in one shot and wait until the achievement pops WITHOUT leaving the upgrade window thus not allowing the game to save the data then simply turn off the game and turn back on.