Not quite difficult. They only appear in 2 or 3 chapters…
re-enslaving the earth: Finish Black Mesa 5 times. (Enslaving because of the combine and re-enslaving for repeating Black Mesa 
)
Save the world: Don’t push specimen into anti-mass spectrometer.
This would probably have to be timed like 5 minutes before you get the achievement…or possibly have the scientists get more and more agitated that you’re not pushing the cart into the beam until they shut down the AMS and the screen goes black saying “Employment Terminated” or something…then you get the achievement. 
Spacely Voice: “Gordon! You’rrrrrrrrrrrrrrrrrrrrre firrrrrrrrred!” B)
The cavalry arrives : Destroy all Apaches.
Womanizer : Kill all Black Ops operatives in Lambda Core in less than two minutes.
Burn Notice : Destroy the tentacle in Blast Pit.
Tic-Tac-Tow : Fire ten TOW missiles.
Freeman’s Mind related…
‘What are we, back in high school now?’ - Find the chart with Newton’s formula for gravitational pull.
‘Oh man… this guy’s a pro…’ - Decide not to fry Dr. Magnusson’s casserole
‘Hey, we really fucked up this time, huh?’ - Talk to Eli and Kleiner in the control room.
‘I hope at least they were jerks…’ - Kill the scientists in the elevator by pressing the call button.
‘Extreme Hopscotch!’ - Complete the hanging box jump-puzzle.
Solving 800 problems a minute - Kill 800 total enemies with the MP5.
‘It’s official, ALL ALIENS ARE JERKS!’ - Kill 20 Vortigaunts with the Glock17.
Why should people get an achievement for not going out of their way to do something? O_o
Haha, I like that one.
Episode 30 is out now btw.
Oh my gosh, yay ^^
[to jethrosoup] I dunno… there would have to be parameters.
Debacle - Fry Dr. Magnusson’s casserole.
Time Paradox! - Don’t fry Dr. Magnusson’s casserole.
I love this idea
^ me too. It seems easy.
My idea is simple and I dont know, someone might have mentioned it yet.
Remember all those secret hidden stashes ingame? Every time i have played the game from start 'till end I always found new stashes I had never seen!
Achievment: Find em all!
We just talked about that on the previous page.
I bet this has already been mentioned, but mabye there could be some sort of “carry a gnome through the game” achievement like there was on Half Life 2: Episode 2 (and L4D2). It wouldn’t have to be a gnome, nor would you have to carry it through the entireity of the game. I just think that it is an interesting achievement idea that could inhance the replayability of the mod without having implement too much work.
Hate, hate, hate those two achievements. But hey, maybe I’m alone in this opinion.
I can’t think of anything highly symbolic from HL1 that could be used, anyway. The crowbar? :retard:
The gnome wasn’t that symbolic but perhaps there could be a plastic pink flamingo in one of the lockers at the beginning of the game. :retard:
I admit that i like this. And with all the circles you run, it wouldn’t be too hard (i actually had an easy time doing it in Ep2, you just have to have played it once to know what areas you’re going to revisit, then it’s easy.)
Maybe the devs can insert some candidate objects, and, once the mod’s released, see how players react to them. Then they can make it an Achievement to carry the crowd-winning object through a patch.
My Nominees: Coffee mug, something from Gordon’s locker, any sort of doo-hickey sitting on a computer monitor in AM.
Hula bobble doll?
It would connect with Half Life 2. 
B) fuck yea, man. just sitting next to Dr. Kleiner’s keyboard, that would be awesome. I really don’t think i can top that…
saving ammo - complete the game only with crowbar and explosives.
tell me how are you going to kill Nihilianth and protect the scientist from the controllers then