A Steward badge can be received for every review queue. For StackOverflow that amounts to 8 (eight) badges.
Q&A for programmers
select top 100 b.userid, u.displayname, count(*) as gold, max(b.date) as dd
from badges b
inner join users u on u.id = b.userid
where name in ('Steward')
group by b.userid, u.displayname
order by gold desc, dd