The `AchievementTagHandler` expects `Main.Achievements` to be non-null,
which is not normally the case on dedicated servers. When trying to
parse an achievement chat tag, it will instead throw.
The tag is parsed when calling `ChatManager.ParseMessage`, which is used
in TShock when writing chat messages to the console. Our `OnChat`
handler uses `Utils.Broadcast`, which will send the message to all
connected clients, write the message to the console and the log. Due to
the order of execution, the message ends up being sent to all connected
clients, but throws whilst trying to write to the console, and never
gets written to the log.
To solve the issue, we make achievements available on the server,
allowing the tag handler to work as expected, and even allowing the
localization of achievements names to appear in the console.
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