Eh, most of the achievements could be a bit more unique.
Still wanna see some kind of an achievement based on killing more than 4 enemies with a crossbow bolt. I've destroyed two FPs before with one bolt through their heads, quite fun. The name could be The Killshot or Double-Play.
There should be an achievement for doing so much damage to the patriarch with the firebug. It could easily be named Shoo firefly, don't bother me. Need to see more people chase down that ham with the roaster. Watch him burn alive.
I'm a Lumberjack, could be an achivement where you kill a fleshpound with the fireaxe, as a firebug.
Fatman, kill so many bloats with explosives.
The Samurai, use the katana for an entire game.
The Whites of their Eyes, get 30,000 headshots. I know a few people would probably already get this instantly.
Tunnel Vision, knife the Husk from behind.