Here is the full list of all 15 Signs of Life achievements.
Cook and eat human flesh.
Discover the fate of the Hermes Captain.
Get brown on you.
Craft a brilliant gem.
Craft a faceted gem.
Craft a refined gem.
Craft a rough gem.
Wreck the Buff Mechington.
Find a jug of piss. For some reason.
Drink an explosion potion. For some reason.
Defeat the Buff Mechington with a kick to the butt.
Make a lewd gesture with the Magnetic Inductor while in a bed.
Soil a chicken with dung.
Kill a chicken with an egg.