The ref achievement is a A + B requirement, i.e. you need x amount of users referred and to have earned some ref rewards from them. This is mostly to avoid rewarding bots/multi accounts. I'm sure early adopters will get around to get some ref rewards as well eventually once the game is out hopefully in the very near future (currently becoming ready for alpha testing to a few select testers)!
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This clears it up, thank you.
This is great news, yay!