Oh I thought they were first
Tbh, people who put the effort in on betas deserve the upper hand, don't you think?
Its not a question of rewarding people for beta testing. Its about recognizing the fact that there is such a tremendous advantage in learning the content before release by beta testing it, that allowing those people to claim "world first" achievements thanks to that knowledge renders the achievement meaningless. I'd say either exclude beta testers, or don't even have an award at all.
At best I think beta testers could get a "beta first" achievement, as I said. But world first is silly for them.