Full list of all 43 Immortal: Unchained achievements.
The base game contains 31 achievements, and there are 3 DLC packs containing 12 achievements.
Finish The Pilgrim's Pilgrimage questline
Kill 100 enemies with an Assault Rifle
Kill 100 enemies with a SMG
Kill 100 enemies with a Launcher
Find all armour shrines
Finish The Lost Hunter Found questline
Equip a fully upgraded weapon in each weapon slot
Complete the Game
Enter Naylon World
Kill Iska. Queen of the Abyss
Kill Arlen. The corruptor
Kill 100 enemies with a Pistol
Finish the Lost Memories questline
Upgrade a weapon to the highest level!
Kill Malog. The raging storm
Survived the attack on the Great Hall
Kill 100 enemies while attacking them in the back
Kill 100 enemies with a Sniper Rifle
After connecting the third nexus point
Kill 100 enemies with the quick melee
After connecting the second nexus point
Die from one of your own attacks
Recover 10000 or more bits from one death
Kill 100 enemies with a Shotgun
Upgrade one of your weapons
After connecting the first nexus point
Decypher an item
Connect with the Monolith
Find an armour shrine
Get all achievements
Find all Lore Items
Get cursed while playing as The Cursed One
Finish a normal playthrough as The Cursed One
Get all curses while playing as The Cursed One
Complete New Game++++
Complete New Game+++
Complete New Game++
Complete New Game+
Kill 100 enemies with a lightning blaster
Finish the Nayra questline
Collect all lore items in Storm Breaker