The achievements look more sane on the whole. I think I might actually be able to get some of them!
Some of them are hilarious, though. LOL @ "OMGWTFBBQ." I guess the Pyro's secondary taunt does damage now
The new Pyro weapons sound great...particularly liking the new secondary fire on the regular flamethrower as well as the flare gun.
EDIT: According to PC Gamer UK you don't need to get all the achievements to unlock the bonus weapons - they are unlocked at 15, 20 and 25 achievements for the Flare Gun, Backburner and Axetinguisher respectively (there are 35 achievements total), so you don't have to get the silly ones in order to get your new Pyro bling.