Which ones? the original acheivement pack (an addon), or the ones that came after a recent update?
The one’s that Garry made, The first released Achievements in an update.
I need to get me a decent desktop 'cause I haven’t seen those yet (my current system is good enough to PLAY Gmod but nonetheless the textures are all screwed-up)
Well if you people won’t use my genius achievements I’ll just go make my own AWESOME mod and use them! > 
this is a bad idea post an achevement idea thinking it will be used in any way shape or forum
Hey, nice! You just earned your own achievement. 
Haha, awesome. I was pretty sure from his reply that he hadn’t understood what I wrote, but that’s just genius.
Pretty sure even darkone isn’t dumb enough to think his achievement would be in the mod (I know I wasn’t when I posted the same thing) so no, not really.
Ahh, I’d just like someone to credit my achievements ideas. Sayin’ they were good 'n all. I mean I worked hard on good pun-filled names. 
Peregrine Failure - Take down the overconfident cliff-side helicopter using nothing but satchels.
I managed to take that helo down with it’s own rockets…before I even went outside again to see it…!
Crowbar killer- Kill 20 headcrabs with crowbar
Crowbar assasin - Kill 100 enemies with crowbar
It does shoot itself down sometimes. Crashes into the cliff and explodes, too. Silly pilot.
Bullshit. Prove it.
More specifically, it fires the rockets while too close to the cliff if you are standing in the right part of the cave (near the RL), and catches itself in enough of the splash-damage to kill itself.
It’s quite repeatable too.
Yeah well… I said PROVE IT.
What do you want? A video clip? It happens, seen it plenty of times. On Hard mode, too, so that’s a lot of splash damage. Get to the cliffside part, pick up the rocket launcher, run outside the cave so the helicopter sees you, run back to near where you got the RPG. I think that’s the correct positioning, been a bit.
I’m not about to fire up HL here at work, behind the corporate firewall thru which Steam doesn’t work…
It sometimes does it when the chopper doesn’t even see you.
Heh, nice. But yeah, easy way to save rockets…
So is the one where you kill the tank (Bradley) at the end of a road that is busy firing rockets at you by simply turning on the RL laser and guiding the tank’s rockets into the ground close enough to it to kill it (eventually).