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.
Kill 50 rebels.
Die 100 times.
Complete the game on Normal mode or higher.
Beat the game on Bad Cop difficulty.
Ignite 20 Zombies using flares.
Sneak through the rebel encampment.
Get 5 kills using Manhacks only.
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?
Find the reference.
Return the doll.
Throw it in a trashcan.
Pick up a can.
Survive the grenade encounter.
Find a prototype AR2.
Survive the betrayal.
Find the dead rebel leader.
Kill 40 rebels.
Kill 30 rebels.
Turn the turrets back on the rebels.
Kill 20 rebels.
Kill 10 rebels.
Wake up stranded in City 10.