Tomoya delivering the winning shot in the basketball game. Doubles as a Heartwarming Moment when you know who spurred him on.
Sunohara taking on the entire soccer team back he was a freshmen. Talk about Badass Decay...
When he pulls a Big Damn Heroes to save Mei from that same team, it's even more awesome.
Tomoya earning his happy ending at the end of After Story. After going through hell, having his wife and child die, all of the good things that he did before come back and reverse time so he can live happily with Nagisa and Ushio.
How about Tomoya fighting a gang leader and not only holding his own, but actually getting hits in and practically ending it in a draw? He might not be as proficient of a fighter as Tomoyo but he's still pretty awesome.
Still, it's undoubtedly Yukine who earns the awesome award for that episode, as she succeeds in preventing a battle between the two gangs.
Nagisa gains one of her own in After Story, when Tomoya is having a massive Heroic BSoD in which he's punching a wall in anger over losing a good job chance since his dad has been sent to jail... and not only she gives him a Cooldown Hug, but she manages to pin him to the wall to stop him from harming himself further, nevermind that Tomoya is taller, physically stronger and quite healthier than Nagisa and not exactly in control of himself... Therefore, it's a big Take That! to those who accuse Nagisa of being a weepy and whiny wall-flower. Sheisn't. And she definitely earned the marriage proposal that followed.
During their "date", Sunohara, Sanae, Tomoya, and Nagisa run across a group of boys bullying a little girl. Before they go over to do something, the young girl's older brother comes just in time and chases the brats away. Also doubles as a Heartwarming Moment.
Though it's also definitely soulcrushing, the fact that after having their daughter die before them—probably the most agonizing pain that no one should ever go through—Akio and Sanae keep it together to raise their granddaughter and support their son-in-law. Sanae actually refused to cry for five years just to take care of Ushio. People cite them as two of, if not the, best parents in anime for a reason.
At a meta level, Sekai Project's English version of the VN topping Steam's top-selling new games the day of its release, as well as ending up in the top 5 best-selling games, at least for a few days. Truly a watershed moment for Visual Novels in the English-speaking world. Not to mention the massively successful Kickstarter campaign to fund the translation.