Style of the Crusader

you won't get this achievement until all the associated armor pieces are nonrefundable. the easiest way to make armor pieces nonrefundable is to just destroy them.

There is no tier 9 for monks or demon hunters.

Due to a series of changes since its original release, this tier is sold for gold (take THAT, RNG!). Just fly to the Argent Tournament grounds in northern Icecrown and talk to your Sunreaver (Horde) or Silver Covenant (Alliance) representative outside the entrance to [zone=4722]. You can also look in the inventory at the vendors for you class/armor proficiency in Dalaran-Northrend (plate will be at the BS, cloth at Threads of Fate, etc.).

Some additional notes:

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• Tier 9 has two looks: one for Horde, one for Alliance. Changing the difficulty will not change the appearance for your faction.
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• Tier 9 has three flavors: ilvl 232, ilvl 245, ilvl 258.
  - 232: just gold
  - 245: gold + [item=47242] (but it looks the same as the 232 version and the trophy sells for 50g, make some of your money back!)
  - 258: involves a chest that was removed somewhere around patch 4.0. Unless you're coming back to the game after a very long hiatus, this ilvl isn't an option.
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• [npc=35013], one of the bosses in [zone=4603], can drop glove and leg Tier 9 PvE pieces. These are actual pieces of gear and not tokens.
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A completed set of any difficulty will reward this achievement (please comment if this does not carry over from ptr to live). Lookalike sets will not.

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Criteria of the meta Azeroth's Next Top Model, wowhead wrote up a full guide for the pve sets here.

This achievement popped up for me while playing my warrior, but the warrior set wasn't completed. I then checked my paladin and death knight and neither of them had the set full either. is this achievement bugged or something?