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.
Find all of the poem pieces.
Find all of the Lambda Generation tags.
Ignite 20 Zombies using flares.
Find the reference.
Return the doll.
Throw it in a trashcan.
Pick up a can.
Find and wobble 7 Hula dolls.
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?
Survive the grenade encounter.
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.
Get 5 kills using Manhacks only.
Wake up stranded in City 10.
Die 100 times.
Complete the game on Normal mode or higher.
Beat the game on Bad Cop difficulty.