Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Are you okay, buddy?	Play for at least one hour with less than 20% health.
Better than therapy	Get fifty kills by headshots.
Bull in a china shop	Trigger fifty enemy alarms.
Clean hands	Play through the game without killing anyone, including robots and turrets.
Clean-O-Bot 3000	Clean up hundred blood splatters.
Don't care	Step into at least thirty dangerous environmental puddles.
Evolutionary dead-end	Have three cloning errors at the same time.
Gotcha, Boomer!	Finish the game on 1999 mode difficulity.
Hero we deserve	Finish all the NPC side-quests.
Hobo for life	Finish the game without spending any money in vending machines.
Hygiene obsession	Clean up at least fifty blood splatters.
I prefer my payment in cash	Collect 2.000 credits without dying once.
I'm MacReady!	Finish the game on Russ Kurtell difficulity.
I'm all out of bubblegum	Upgrade all your weapons to the maximum.
Muta-Freak	Buy all the Mutamods.
Never there	Finish the game in "ghost mode". Never detected by any kind of enemy.
Not the best outcome...	Reach the "Bad" ending.
Out of madness	Finish the game on any difficulity.
Psycho-mode!	Kill at least five from every enemy type in the game, bosses not included.
Radio Ga Ga	Find all audio logs in the game.
Score!	Dump five heads into bins.
Space tourist	Explore all main sections of the station.
Squat master	Walk 5000 steps while crouching.
Tech-guru	Buy all the tech-gadgets.
The Master Exploder	Build the secret weapon!
The Rite	Find the way to kill Charley.
This is NOT the way	Finish the game in "no-hud" mode, so never use a helmet in one entire playtrough.
Too good to be true	Reach the "Good" ending.
Warren Wrenchman	Finish the game using only the Power wrench and the HyperBroom as weapons.