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