Memories of Vlast not bound — Guild Wars 2 Forums

Memories of Vlast not bound

I completed the achievement 'Vlast from the past' and got an item called 'Memories of Vlast' which replays all of Vlast's messages in order when used. Since it's from an achievement, shouldn't it be account bound? It's tradeable and there are some in the trading post for sale. As far as I know the achievement is the only way to get it, and only 1 per account.
https://wiki.guildwars2.com/index.php?title=Memories_of_Vlast

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