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 40 rebels.
Kill 50 rebels.
Die 100 times.
Find all of the poem pieces.
Ignite 20 Zombies using flares.
Find all of the Lambda Generation tags.
Find and wobble 7 Hula dolls.
Return the doll.
Sneak through the rebel encampment.
Throw it in a trashcan.
Pick up a can.
Complete the game on Normal mode or higher.
Beat the game on Bad Cop difficulty.
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.
Did you hear that?
Find the reference.
Survive the grenade encounter.
Get 5 kills using Manhacks only.
Find a prototype AR2.
Survive the betrayal.
Find the dead rebel leader.
Kill 30 rebels.
Turn the turrets back on the rebels.
Kill 20 rebels.
Kill 10 rebels.
Wake up stranded in City 10.