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.
Evict 20 Vortigaunts from Pillar 10. And from the realm of the living.
Destroy the Quantinode core.
Kill the possessed Hunter.
Experience your first CFLU fever.
Survive the tunnels.
Protect the Stalker in the tunnels.
Find and wobble 7 Hula dolls.
Find the reference.
Survive the grenade encounter.
Did you hear that?
Get 5 kills using Manhacks only.
Find a prototype AR2.
Survive the betrayal.
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.
Kill 10 rebels.
Wake up stranded in City 10.
Find all of the poem pieces.
Find all of the Lambda Generation tags.
Pick up a can.
Throw it in a trashcan.
Return the doll.
Ignite 20 Zombies using flares.
Die 100 times.