If Hammer Had Achievements...
Aw, that hurts: make a trigger_hurt with hurt value more than 100
Suicidal tendencies: make a trigger output "Kill" to !activator
I see rainbow 2: place the player inside a hollow cube covered entirely with nodraw texture
(percentage calculation sphere self-test failed!)
108.1% done, -8.1% remaining...
Released here!
All maps for Portal (1/2) worth playing are mirrored here.
run it on a poo computer 
I remember back in the old days around 1997 when I first started to use Worldcraft (ex-hammer) and created our house and its outdoor area for quake, it took half an hour to compile it fully
I dont really like instances, prefabs ftw
I never modify things that I want to change in every other map, and to edit them I must save as another instance. I just collapse every official instance...
My achievements:
Picasso paints it all: create a map without using any nodraw texture
I like it sharp: make a map where every texture's face has its lightmap scale set to 1
I like it pink: use cubemaps but dont use buildcubemaps
Cubemapper: put cubemaps everyvhere, until the bsp's size reach 50MB after building them
Test for dummies: make a level with an arrival elevator that leads instantly into an exit elevator
I have faith: make a map where the fog is so dense that you barely see anything
I'm on the edge: start making a map/room at the top left edge of the hammer grid area
How long does it take? create a looong corridor that goes from the far left of hammer's grid to the far right and then check ingame how much time does it take to...
Like a rainbow: create your map normally, and then for every ligh source, randomize their RGB values 0.255
Spontaneous death: place trigger hurt areas randomly in your map
Black&white: use only 2 texture in the map: a white and a dark one! nothing else!
not too easy: do not use any horizontal/vertical solid-face (0 90 180 27 degree).
Hammer my computer! try to open as many official map into hammer (decompiled vmfs) starting from the first one, as possible without crashing it or running out of memory
I have good eye: turn off grid display and snap to grid and set grid to 1 and make a map...
I always take a close look: create a map using the 9th zoom (key 9) without zooming out!
back to the '90s: change desktop to 800x600 (or to the minimum) before mapediting
lol I want to see anyone work with that. I got several monitors with 1920x1080 and still not enough view 
Portal 2 Playlists: videos 1-200 | videos 201-400 | videos 401-600 | videos 601-800 | videos 801-1000 | videos 1001-1200
Attention to Detail: Build your map entirely out of func_detail
[spoiler][SP] Alternate[/spoiler]
Framerate Ignorer: Create an entire map without any area portals
dude, my hammer goes retarded all the time and i HAVE to build my maps like that(although in all fairness, my maps do suck)
I'm a grade A bad mapper! Do not optimize what so ever and cause the game to crash.
VDC User Page
On the note of this, I think there should be a whole page for just acheivements for Hammer crashing, since it happens so much.
In Soviet Russia, Hammer crash you: You temporarily or permanently give up a project because hammer crashes (or crashed too many times).
I've done my job: Hammer crashes when you just compiled.
It's what you tell yourself: Hammer crashes just before you save it.
Now why did it do that?: Hammer crashes when you have music running, have a process-killing game running, photoshop open, editing a movie file, chatting on MSN, talk on Skype, hacking someone's computer, reading emails... like a boss...
Hammer see, Hammer do: Hammer crashes when the game you just compiled for crashes.
Maybe I should just delete it?: Hammer crashes continuously when you try to edit the same brush or entity multiple times.
Banged the head on the nail: Hammer crashes within 1 minute of you opening it.
But I wasn't even there!? Hammer crashes when you were afk.
Wave the white flag: Hammer crashes when you click the flags tab
The thing did it!: Hammer crashes when you place an entity
Yo dawg, I heard you like to minimise: Hammer crashes when you maximise and minimise multiple times.
Connection crashed by peer Hammer crashes (not responding) when you close the program
Memory loss: Hammer crashes on a new project without it autosaving
I don't like you anymore: Hammer crashes when you try to load a previously saved map
At least I try to be helpful: Hammer crashes when it prompts you to load a map which crashed previously.
Instant Popularity: Compile a map that contains the Companion Cube, cake references, Space sphere and voice lines, and the exploding lemons.*
Instanception: Place an instance inside of itself.
"Innovative Gameplay": Make a map where every surface is a world portal.
I Added Lights!: Create a map where the only light has a brightness value of 0 0 0 1
*I do not take responsibility if the actions described here are fulfilled by another person/robot/sentient cloud/animal king.