Here is the full list of all 31 Entropy : Zero achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Complete the game on Normal mode or higher.
Beat the game on Bad Cop difficulty.
Die 100 times.
Get 5 kills using Manhacks only.
Ignite 20 Zombies using flares.
Find all of the poem pieces.
Destroy the Quantinode core.
Evict 20 Vortigaunts from Pillar 10. And from the realm of the living.
Kill the possessed Hunter.
Experience your first CFLU fever.
Survive the tunnels.
Protect the Stalker in the tunnels.
Find all of the Lambda Generation tags.
Find and wobble 7 Hula dolls.
Did you hear that?
Survive the grenade encounter.
Find the reference.
Find a prototype AR2.
Survive the betrayal.
Return the doll.
Find the dead rebel leader.
Kill 50 rebels.
Kill 40 rebels.
Turn the turrets back on the rebels.
Sneak through the rebel encampment.
Kill 30 rebels.
Kill 20 rebels.
Throw it in a trashcan.
Pick up a can.
Kill 10 rebels.
Wake up stranded in City 10.