Gamer has been removed
It's usually 1-1-2-2-3 When you're upgrading weapon.
+1 = 1 Titanite Shard
+2 = 1 Titanite Shard
+3 = 2 Titanite Shards
+4 = 2 Titanite Shards
+5 = 3 Titanite Shards
+6 = 1 Large Titanite Shard
+7 = 1 Large Titanite Shard
+8 = 2 Large Titanite Shards
+9 = 2 Large Titanite Shards
+10 = 3 Large Titanite Shards
+11 = 1 Chunk of Titanite
+12 = 2 Chunk of Titanite
+13 = 2 Chunks of Titanite
+14 = 3 Chunks of Titanite
+15 = 1 Titanite Slab
- Shard can be bought for 800 souls from Andrei.
- Large Shard can be bought from the merchant in Sen Fortress for 4000 souls or also found in chest around Sen Fortress.
- Chunk can be farmed once you reach the zone filled with black knight (no spoiler here) or from different monster during your playthrough.
- Slab, the only one I found so far dropped from the Stray Demon, similar to the Asylum Demon but found on your 2nd visit of the Asylum. While I haven't found any, some people report getting Titanite Slab from Dark Hand Knight in the Lower part of New Londo.
Making a total of 9 Shards, 9 Large Shard, 8 Chunks, 1 Slab.
You also need 2 embers for the blacksmith to be able to do so.
-First one is found early in the Depth. Should be in the chest in the room with the first Butcher, the kitchen. It will allow you to move on to 2nd stage of reinforcing (6-10)
-Second found is found in New Londo. You have to go through the lower part of New Londo, but the chest containing the ember is actually in the upper part of New Londo, you most likely saw the chest on a ledge you couldn't reach when you explored the upper part. There should be a stair to your left when you get down with the elevator, go up the stairs and explore a bit, you should get to the chest and get the ember. it will allow you to move on the 3rd stage of reinforcing (11-15)
Edit : It's also possible to use shield for this achievement, not only "weapon". Shield are considered weapon. Useless fact: you can dual wield shield, but it's pretty retarded considering you'll do close to no damage with your main hand.