Well the game updated a few days ago and i must say.
Aside from the mobs of heavies on almost every server, which was bound to happen and will die down, I am enjoying this update. The requirements for the Heavy Achievements are overall not very hard, just time consuming.

So far the medic update was time consuming and very very specific. I mean the conditions for most of those were just terrible. The Pyro Update was better for sure. Achievements for efficient killing and defending the teams equipment. Basically being and effective offense class.

Back to the Heavy.
Being a defensive class, achievements are based around protection, and less offensive goals. Although a few have been put in for offensive tactics but hey, how doesn't wanna run a tank into enemy infantry, or in the heavies eyes, ENEMY BABIES!
Mowing down babies with a mini-gun aside.
Valve did something good this time.

Don't get me wrong they do good stuff a lot but in my opinion the medic update was not one of them. Admittedly support classes should be focusing around support achievements but a couple more, less circumstantial achievements would've made it go more smoothly. But it was their first try so I won't hold that against them. No ones perfect their first try unless they're unbelievably lucky.
I think Valve figured out the right system on the pyro and tweaked to to be better.
I can't wait to see what comes next.