LambdaGeneration
Commando Booce

Good luck with the neighbourhood watch achievement, you'll need it.

Unit-11221

Good luck with the gnome achievement

gnome4
Test Subject 29

Been trying to 100% both Portal games since I both got them. There’s just one radio that I can never seem to reach, and I failed miserably at all the challenges or advanced chambers. Plus in Portal 2 I have no one to do co-op with, since you kind of need to do it with someone you know personally for it to work.

Your Average HECU Soldier

Yo I never have a partner either, if you ever need one, check out my Steam Prof and invite me.

Normal Headcrab

Good luck with one free bullet achievement

Your Average HECU Soldier

I don't get how to do Black Mesa Decathlon winner. I never take any damage, and just run through but never get the achievement...

Adrian/Kit

you can't quicksave, if you take damage you have to restart from the start of the map (put: map bm_c4a3a1 in the console)

Your Average HECU Soldier
Reply to Adrian/Kit

OK thanks. I'm pretty sure I quicksaved throughout