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There are no possible championships in WWE that John Cena could not win. The only Championship he had yet to win was the WWE Intercontinental Championship, and it was also preventing him from becoming a WWE Grand Slam Champion. Ultimately, last week on RAW, he defeated Dominik Mysterio to win the IC title and also became a Grand Slam Champion for the first time.
John Cena also won other Championships like a total of 17 World Championships. He won the WWE United States Championship five times, and he even achieved other successes, such as the Royal Rumble match and Money in the Bank ladder match. There is also one Championship he won, and it was the WWE Tag Team championships, which he won 4 times.

John Cena gets accused by David Otunga once again
One of the most forgotten Tag Team partners of John Cena was David Otunga, with whom he even won the WWE Tag Team championships once. David Otunga recently remembered winning the WWE Tag Team Championships with Cena and explained why he could not enjoy the title run with the G.O.A.T. Speaking on the Insight Podcast of Chris Van Vliet, he explained the following;
John Cena and David Otunga won the Tag Team titles at Bragging Rights 2010
“That’s the thing. It is Cena. Which was cool, but he tried to rib me over that. So he didn’t really let me enjoy it, to be honest. Because he tried to rib me by taking the titles, and then he told me, ‘Hey, make sure you grab the titles and take them to the next town.’ Because there’s the TV titles, and then there’s the live event ones.”

They dropped the Tag Team titles only after one day on RAW
“So the TV ones travel, he wanted me to get the live event ones, which I had to go get from Cody and Drew. I was like, okay, all right, I’ll do it. But then he got on his bus and took off, but I guess he had already taken the titles, and he didn’t tell me what his plan was. He wanted me to go crazy backstage, searching for it, and freak out. So I went and asked Drew for the titles, and he’s like, ‘Oh, I already gave them to Cena.’ Okay, that was the end of that.”
John Cena has always been accused of burying a lot of talents, so that he could keep himself on top of them all. The nickname Super Cena arrived as a sign of sarcasm when he kept on winning match after match. But in the later career of Cena, he was a completely changed man, and he even uplifted a lot of talents.