10k damage doesn't take very long when you are high level.
I got the unarmed achievement by going into a casino and punching everything. Low unarmed doesn't matter if you are wearing power armor.
Or low level, even. I somehow missed the damn Blast Master achievement on my energy weapons dude (probably had to TCL out of some hole somewhere and forget to restart the stupid game so steam wouldn't think I was still cheating) so I made a temp character to grind energy kills really quick. Yeah, I know. But I've got a touch of OCD in me and it would have nagged me, that missed achievement staring me in the face every time I logged onto my steam account, silently mocking me, questioning my resolve. I just went killing stuff, not a murderous rampage, mind you, just killing threats as I walked from Goodsprings around the loop towards Novac. I got to 10,000 before I even made it to Ranger Station Charlie. Took an hour at the most, and I ate dinner in between.
-Gunny out.