#7 Win the Andre the Giant Memorial Battle Royal
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Like the King of the Ring, the Andre the Giant Memorial Battle Royal is used primarily as a means to give someone a win that doesn't include a title so they can use that opportunity to boost their career.
This also means that Reigns has far surpassed the point of this being useful to him, but it's still an accomplishment he's yet to do, regardless.
His performance at Royal Rumbles in the past proves that he's got the storyline capability of being able to easily win something like this, but he's always been too busy main eventing the card instead.
It's doubtful he'll fall so far down the card that he'll be in this match instead of either fighting for the title or wrestling in some other high-profile feud, so this is one of the few things you can probably count on him not having on his resume by the time his career is over.