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