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.
Kill The Hammer.
Kill all 5 Warchiefs before any uruk take their place.
Destroy the Monument Gate and topple the statue of Sauron.
Get Ratbag promoted to Warchief.
Capitalize on a Warchief's Fear.
Eliminate the bodyguards of two Warchiefs, then draw them out and kill them.
Witness the creation of The Rings of Power.
Use Strike From Above while at least 60 feet above your target.
Collect 50% of the Ithildin.
Attract caragors with bait 5 times.
Use the Detonate ability to burn 50 uruks.
Complete a Sword Mission and begin growing the legend of Urfael.
Unlock 4 Dagger Rune slots.
Successfully complete 4 Hunting Challenges.
Collect 25% of the Artifacts.
Complete an Outcast Rescue Mission.
Make 20 uruks flee by dropping Morgai Fly nests.
Complete a Bow Mission and begin growing the legend of Azkâr.
Unlock 3 Sword Rune slots.
Complete a Vendetta Mission.
Free 5 caragors from cages.
Discover some of the Wraith's past.
Complete a Dagger Mission and begin growing the legend of Acharn.
Unlock 2 Bow Rune slots.
Successfully complete a Survivalist Challenge.
Make an uruk yours.
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.
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.
Activate all Forge Towers.
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.
Complete all Survivalist Challenges.
Bait 10 Ghûl mounds.
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.