Creating a new account on tutorial island getting this message.
I currently have two clients open one (main) that has achievement rewards available but it appears to be coming up on a new client / different account.

This is due to a bug with the Daily Task Indicators, which literally aren't working at the moment. Cromperty's pure essence isn't even supposed to be unlocked until you finish the medium Ardougne diary.
I believe this was fixed in #2963
I expect that would've fixed it too, yeah.
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This is due to a bug with the Daily Task Indicators, which literally aren't working at the moment. Cromperty's pure essence isn't even supposed to be unlocked until you finish the medium Ardougne diary.