It's Finally Mine...

Achievement is rewarded after buying a Bloodrave weapon.

[slightly uncertain information]

Bloodrave was bought with Killing Spree credits, originally rewarded in Fraywind Canyon and Champions' Skyring. FWC was released with "Argon Queen" in update August 2012. Champions' Skyring was released with free-to-play update.

Some old site says that the weapon required 2,000 rating on Champions' Skyring so you could buy it.

When Bloodrave was outdated it was still required material for Nightforge PVP gear. Unknown when this gear was removed from shop, but it's not possible to get the achievement anymore.

Achievement is only for 8 classes. Reapers never got this gear or "Blood-Soaked Reaper" title. (There is such title in game, but it's specially made for one player as pvp related award.)

Links

 * screenshot of lancer Bloodrave gear, Steamcommunity