Here is the full list of all 74 Middle-earth: Shadow of Mordor - there are Game of the Year Edition achievements worth 1,680 gamerscore.
Bait 10 Ghûl mounds.
Use a Wretched Graug's Projectile Vomit on an Uruk Captain or Warchief.
Start a Riot by commanding a Warchief to attack another Warchief.
Activate the Blazing Steed.
Eat a captain with a Wretched Graug.
Kill The Black Hand.
Kill The Tower.
Kill the Great White Graug.
Save Lithariel's life.
Brand all 5 Warchiefs.
Lift Lady Marwen's curse.
Brand a Captain while in combat.
Activate all Forge Towers.
Kill The Hammer.
Kill all 5 Warchiefs before any uruk take their place.
Destroy the Monument Gate and topple the statue of Sauron.
Eliminate the bodyguards of two Warchiefs, then draw them out and kill them.
Complete a Vendetta Mission.
Capitalize on a Warchief's Fear.
Get Ratbag promoted to Warchief.
Kill a Caragath with an Execution.
Begin a new hunt with Torvin.
Make 20 uruks flee by dropping Morgai Fly nests.
Witness the creation of The Rings of Power.
Collect 50% of the Ithildin.
Free 5 caragors from cages.
Attract caragors with bait 5 times.
Collect 25% of the Artifacts.
Unlock 4 Dagger Rune slots.
Use the Detonate ability to burn 50 uruks.
Use Strike From Above while at least 60 feet above your target.
Unlock 2 Bow Rune slots.
Unlock 3 Sword Rune slots.
Successfully complete 4 Hunting Challenges.
Complete a Sword Mission and begin growing the legend of Urfael.
Complete a Bow Mission and begin growing the legend of Azkâr.
Complete an Outcast Rescue Mission.
Discover some of the Wraith's past.
Successfully complete a Survivalist Challenge.
Complete a Dagger Mission and begin growing the legend of Acharn.
Make an uruk yours.
Acquire a level 25 Rune.
Maximize the power of the Ring by completing all of the One Ring missions.
Collect 100% of the Ithildin.
The One Ring has returned to it's Maker.
Get a Level 30 Rune in Test of the Ring.
Poison a Captain at his own Feast.
Shadow Brand 20 Uruks.
Perform an Execution on a flaming Berserker.
Wraith Flash Dominate 50 Uruks.
Build all the Forge Towers in Udun.
Complete all Urfael Legend Missions.
Stealth Brand a Captain.
Kill a Graug by dispatching your Ghûls on him.
Catch a Ghûl Matron on fire during the Lord of the Hunt campaign.
Issue a Death Threat, and then successfully kill the target.
Complete 25 Caragath Stealth Kills.
Complete all Outcast Rescue Missions.
Complete all objectives in the Test of The Ring.
Complete all Hunting Challenges.
Help a Captain survive a Recruitment Power Struggle, and then kill him and all his new recruits.
Have 20 Branded Ghûls at one time.
Complete all Survivalist Challenges.
After an uruk kills you to become a Captain, help him become a Warchief, then kill him.
Collect 100% of the Artifacts and listen to their memories.
Brand 5 Bodyguards of a Warchief, turning them against him in combat.
Have a dominated Caragath, Wretched Graug and Spitter Ghûl simultaneously.
Complete all objectives in the Test of the Wild.
Complete all Acharn Legend Missions.
Complete all Azkâr Legend Missions.
Defeat all the Beastmaster Warchiefs.
Challenge the Dark Lord in Mordor.
Brand 20 Uruks in 60 seconds.
Liberate 30 slaves in 180 seconds while riding a caragor.