His response to the whole Retsupurae controversy and his controversial comment, pretty much destroying the general image that some of his Hate Dumb like to portray him as; extra points for not doing it with sarcasm or ranting (even considering his previous comments an Old Shame). Regardless of what side you fall on regarding PewDiePie's entertainment value, the fact he can be mature enough to do this kind of response despite what his Hate Dumb likes to paint him as is awesome.
Also a Crowning Moment of Heartwarming as he yet again thanks his fans for helping him be in the position he is in.
Even better is that Retsupurae, when discussing him shortly after the Adults React video, admitted to doubting that anything would ever make him change his ways, as long as he was still making money.
Him managing to get the Slenderman, of all people, to stand still (well, more or less stuck behind a car) and then proceeds to film his balls for a few seconds before he disappeared.
When Pewds is playing Sonic.exe and Robotnik's level cuts to static, he keeps repeating "Don't come out of the screen, Sonic...". When he finally does come out of the screen (The "I am God" picture), Pewdie doesn't so much as freak out, just giving the picture a solid look and then going: "Okay, I mean, Sonic, you're not that beautiful. Let's be honest." For a guy who has been notoriously known screaming at these sorts of things, it's awesome for him to learn from his past and adapt accordingly.
During his Dark Souls playthrough he managed to beat the Iron Golem without Tarkus (for context, this boss is considered ridiculously hard, if not nigh-impossible, to beat unless you get an ally spirit named Tarkus to help you). Even Pewds is surprised and he spends the next minute celebrating.
"Praise the sun!"
Pewds is the #1 most subscribed channel on Youtube (not counting Youtube's channels). That's one hell of an accomplishment.
Pewds being able to raise $450,000 ($200,000 more than his goal) for his Charity: Water campaign to help the less-fortunate get clean drinking water. Also doubles as a CMOH.
In one of his Outlast videos, there's a scenario in which Pewdie accidentally comes out of his hiding locker. He quickly hides in the one next to it. Three guesses which locker the enemy checks.
In one of his Pewds Does Everything videos, he smacks his butt with a banana, and when he notices the camera he awkwardly throws the banana backwards. It then lands perfectly on the table behind him.
In his Goat Simulator video, he makes his goat collapse on the ground just as a car drifts by and just barely misses hitting him.
In one of his Trouble in Terrorist Town videos, he jumps off of a building and ends up landing on CaptainSparklez. The round ends, as CaptainSparklez was the traitor the entire time and Pewds had killed the traitor without any intention.