Work Shy - spend twenty minutes wandering the Anomalous Materials lab before putting on the hazard suit.
Bare back squid rider - jump onto a bull squid’s back.
Best name ever for this achiev.
Bag it and tag it commit a murder
Dressing Lightly
Pick Up the Hazard Suit
Killing Floor
Kill all the vortiguants in the Xen Factory Level
It’s Time to Abort Your Whole Freaking Species!
Defeat The Nihilanth
(Cause the Nihilanth is like a giant baby and is the leader of the bad guys, it makes sense in a wierd way)
Pacifist
Avoid killing all the bad guys in BM except the ones who have to die
Warmonger
Kill everything in your path
You Suck
Get a 3 kill streak standing still (camping)
Come Get Some
Take on X number of opponents at same time and win
Would you describe yourself as completely flame resistant or just extremely flame resistant?
Burn the tentacle to death
You Got FROHWNED
Teamkill a scientist by throwing a bicycle prop at him(if there is one)
OR
Teamkill yourself and multiple people around you by acting like Gordon Frohman
Hope one of these makes it 
Shut. Down. EVERYTHING
Close all the emergency fire doors in that one chapter (what were those fire doors for, anyway?)
Fire :hmph:
haha…
Locked Out - Run out of Ammo atleast once, for all weapons in-game
Too Hard to Handle - Die 1000 times
Prone to Death - Die in inbound
Gordon get away! - Die during the Anonymous Materials test
Toadfool - Find gnome Chompski on the surface and place him in the Nihilanths brain, thus teleporting him to Ep2.
(Toadfool, pun on toadstool, where gnomes hang out)
It’s Over Nine Thousand! - Heal total of 9001 HP.
It happens - Die 5 times during “Unforeseen Consequences” chapter.
Invincible - Take 1000 points of damage during one life.
Bill Nye the Science Guy - Kill all the scientists you can kill during the game.
Heavy Weapons Guy - Kill 50 enemies with the RPG.
Crowbar ninja - Kill 50 enemies with the crowbar.
I’m teh Superman! - Complete the game with an alternate ending.
Diet, dammit - Destroy the microwave in “Anomalous Materials” chapter.
Epic Fail - Die by falling off the trainstation at the beginning.
Get on the ball - Gaussjump yourself to death.
Soda Hunter - Destroy all the soda machines.
Crab People - Kill 99 headcrabs.
Body? What body? - Die in the trash compactor.
Mario - Fall at some HECU Soldier’s head.
Sacrifice - Die 666 times.
I lol’d - Turn on alarm 5 times in “Anomalous Materials” chapter.
I think no - Kill GMan.
Cockroach no more : beat the game on easiest setting.
Space Biker: Find a bicycle in Surface Tension and carry it to Xen.
Achivement Unlocked,Crowbar Madness
Complete the Whole Game By Only Using The Crowbar
How original.
My finger slipped!: Shoot one friendly NPC once with any weapon
What about…
BOOM HEAD SHOT: Make 1000 headshots!
(sry about my english)
or
(u choose a name ._.): Kill 83742346 enemys with a single granade
dont know if someone already told this ._.
oh lordy…
Why would anyone have suggested that? It’s not even possible.
Welcome to City-17 - Find Breen’s head.
Tetris - Make a wall 4 crates wide and 4 crates tall.
Pixelhunting - Press [USE] 1000 times.
Zero G - Fall off a map.
Eww! - Gib every scientist in “Anomalous Materials”.
OMGWTFGORDON - Fall off 100 feet and land on Alien Grunt.
Hot Coffee - Make Vortigaunt shoot coffee machine.
GORDEN SH*T BRICKS - Find a pink brick.