A Royal Flush is the rarest hand you can get in Texas Hold 'Em, so you'll earn a medal if you get one!
(You don't need to be a Power Player when you get a Royal Flush for it to count, but you need to be a Power Player for the medal to show up.)
Medal Levels:

Single
One Royal Flush, using one hole card
"Multi"
Multiple Royal Flushes, using one hole card
"Hard"
One Royal Flush, using both hole cards
"Hard Multi"
Multiple Royal Flushes, using both hole cards
"Rainbow"
A Royal Flush in each suit
"Hard Rainbow"
A Royal Flush in each suit, using both
hole cards for each