Here is the full list of all 45 Of Orcs And Men achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Finish Chapter 5 at any difficulty level
Finish Of Orcs and Men at Easy level
Finish Of Orcs and Men at Normal level
Finish Of Orcs and Men at Hard level
Finish Of Orcs and Men at the highest difficulty level
Finish Chapter 4 at any difficulty level
Kill Emperor Damocles
Finish Chapter 3 at any difficulty level
Follow the path of the Master
Follow the path of the Berserker
Follow the path of the Assassin
Follow the way of the Shadowgoblin
Kill the Imperial officer in the Monastery
Finish Chapter 2 at any difficulty level
Break 15 spinal columns while Berserk
Put together a special squad to assault the Pillar
Put together the best squad possible to assault the Pillar
Take pure water to the Shaman of the Mire
Kill all the dug-in foremen and guards
Poison three different enemies at the same time
Spare Dakath the repentant
Find and empty 20 chests
Confront Braggart with his lies
Kill Gorkash the Head Foreman without further ado
Be buddy-buddy with a force of nature
Let Styx take out the Imperial sentinels of the Mire on his own
Prevent a miners' revolt in the Mire
Equip a full set of upgraded equipment (weapons and armor)
Survive the Row
Learn and improve every Skill in a single tree.
Complete Chapter 1 on any difficulty setting
Put an end to the madness of the Shaman of the Bowels
Defeat a boss without using an automatic attack (assassinations excluded)
Learn every Skill in a single tree.
Hit eight enemies with a single attack
Win the Black Hand challenge
Save a brunette in distress
Assassinate 47 enemies
Kill Dorek the Trainer
Deal with the Scourge issue in the shantytown
Trade an item
Upgrade a Skill
Bind Skills to both of each character's shortcut keys
Answer Sork's provocation in a language he understands
Have Styx calm things down a bit