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.
Activate all Forge Towers.
Collect 50% of the Ithildin.
Use Strike From Above while at least 60 feet above your target.
Successfully complete 4 Hunting Challenges.
Kill The Hammer.
Destroy the Monument Gate and topple the statue of Sauron.
Get Ratbag promoted to Warchief.
Make 20 uruks flee by dropping Morgai Fly nests.
Free 5 caragors from cages.
Collect 25% of the Artifacts.
Unlock 4 Dagger Rune slots.
Successfully complete a Survivalist Challenge.
Witness the creation of The Rings of Power.
Attract caragors with bait 5 times.
Complete an Outcast Rescue Mission.
Complete a Dagger Mission and begin growing the legend of Acharn.
Complete a Sword Mission and begin growing the legend of Urfael.
Use the Detonate ability to burn 50 uruks.
Unlock 3 Sword Rune slots.
Unlock 2 Bow Rune slots.
Complete a Bow Mission and begin growing the legend of Azkâr.
Discover some of the Wraith's past.
Make an uruk yours.
Capitalize on a Warchief's Fear.
Acquire a level 25 Rune.
Brand a Captain while in combat.
Begin a new hunt with Torvin.
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.
SECRET
Poison a Captain at his own Feast.
Shadow Brand 20 Uruks.
Perform an Execution on a flaming Berserker.
Eliminate the bodyguards of two Warchiefs, then draw them out and kill them.
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.
Kill a Caragath with an Execution.
Issue a Death Threat, and then successfully kill the target.
Complete 25 Caragath Stealth Kills.
Complete all Outcast Rescue Missions.
Brand all 5 Warchiefs.
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.
Eat a captain with a Wretched Graug.
Have 20 Branded Ghûls at one time.
Kill all 5 Warchiefs before any uruk take their place.
Complete all Survivalist Challenges.
Bait 10 Ghûl mounds.
Complete a Vendetta Mission.
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.
Activate the Blazing Steed.
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.
Start a Riot by commanding a Warchief to attack another Warchief.
Liberate 30 slaves in 180 seconds while riding a caragor.
Use a Wretched Graug's Projectile Vomit on an Uruk Captain or Warchief.