I think the Avatar pages need some serious content revision. Some stuff is too high, too low or doesn't have enough evidence and the feats from comics and the (canon) Korra video game aren't included.
Anyway some Aang feats from the comic incldes:
- (Avatar state) Using Earthbending to make large
trenches around a city . Might be multi-city-block or town level but I'm no expert.
- (Avatar state)
One-shotted a war spirit with a Waterbending blast. The spirit was threatning to obliterate a small town so he might be around that level.
- (Avatar state) Aang could also fight the spirit one-on-one with his own
giant earth armor and could
knock him down with Airbending gusts
There might be more that I'm forgetting, but those are the ones I remember. There's also more comics coming out soon, some which I haven't read yet.
The Korra video game also has these feats for Korra:
- In non-Avatar state she took on
three building-sized dark spirits at the same time and won (AP feat?). Could take hits from them (Dura feat).
- In non-Avatar state she
took hits from building-sized mechs and even countered them (Dura feat). (In the show she defeated them but never took physical hits from them)
- Almost on par with Hundun while in non-Avatar state who
did this (AP and Dura feats?). She stomped him in Avatar state later on.
There's probably more but that's what I can remember for now.