#6 Outlast the Elimination Chamber
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If Reigns does not win the Royal Rumble in 2018, it can be surmised, then, that he will win a No. 1 contender's match at either Fastlane or in the Elimination Chamber itself to earn the right to challenge Brock Lesnar at WrestleMania.
This depends not just on the Royal Rumble outcome, but WWE's preferences as far as determining that challenger, as last year, the Elimination Chamber was not used to declare the champion's opponent, but to have the title on the line.
In any fashion, as challenger or champion at stake, Reigns has yet to enter and survive an Elimination Chamber match as the man who stands tall among five losers he's vanquished.
2018 could be his year, though, so stay tuned come February.