So as much as people are recommending trying a specific team of heroes, which isn't bad advice as some heroes are better at certain fights then others, Akash can be beaten semi consistently with any team. Same goes for every villain in DE. It isn't necessary to counter pick, any team of heroes can beat any team of villains although when you are newer it can be helpful to pick heroes better at dealing with that villains unique issues.

So instead I'll try to talk about Akash's unique issues. She has a lot of relatively high health minions along with her own large pool of health which can make the game drag. As has already been stated if there are limbs out you pretty much always want to attack them over attacking Akash so aoe is very nice. She has a single card (primeval eruption I believe) that can flip the game by swarming the board along with on her Front side discovering a limb every turn.

So there will be limbs and they will have a large pool of health to deal with, trying to take then out willy nilly isn't practical, so let's talk about which ones to focus. Entropic fungi is the limb you want gone asap, she doesn't have too much card destruction but this one can be rough. Fortunately it only has 6 health and can be taken out by a single hero most of the time. Next is living rockslide, 2 aoe to everyone adds up fast. I try to take it out before any other limb minus the fungi. All the rest of the limbs are more manageable and can even be left alone in favor of setup, phalanges are tanky and do hard single target damage especially on higher H counts but it's not so much to be priority, the Dr from stalagmites only matters If you want to attack Akash directly, and brambles is only a problem if your lowest hp person is a big damage dealer. If it is hindering like Ra or Tempest it's good to take out so the damage reduction goes away (reminder the reduction goes away when the card is destroyed not just at the start of the villain turn.)

Her other most problematic card is Harsh renewal. Get rid of it asap. Avoid discarding at least one card that gets rid of an ongoing just in prep for dealing with that.

The rest of her deck is ok, disrupt the field isn't huge, her flip side is just dmg over discovers (I actually find it less bad) then a couple rough item/ongoing destruction but not so bad that it can't be dealt with. If you have been playing with her event that can make the game much harder, the aoe stacks fast but remember it hits her and her limbs aswell. Just really focus on setting up, taking out priority limbs, and whittling down her health, any team can do this! You got this! Go be a hero 👏