I'm using this plugin, so simple, does the job great, I love it!
I have one other tweak to those of us making these dedicated achievement servers.
Attached is a zip file containing tf_weapon_medigun.ctx, that file needs to replace the one in your tf/scripts directory.
That file determines how much healing the medigun gives. I set it to extremely high.'
Also put this in server.cfg:
sm_cvar tf_max_health_boost 1000
Then people can heal and get those other 2 achievements. I realize there are a bunch of servers out there doing this already, but I figure there's a lot of us wanting to run our own for our friends. And that is how they did it.
Don't forget to die after you get the 10,000 points of healing, you won't be awarded the achievement until you die or change classes.
Here is where I found the info on how to edit the tf_weapon_medigun.ctx