Here is the full list of all 40 Running Shadow achievements.
Kill 3 Nephilims
Collect 10000 coins
Complete 50 missions
Complete 10 missions
Collect 1000 coins
Run 1000 meters
Run 10000 meters
Kill 10 enemies
Kill 100 enemies
Run 50000 meters
Run 1000000 meters
Kill 500 enemies
Kill 1000 enemies
Kill 30 Nephilims
Kill 200 Nephilims
Kill 500 Nephilims
Collect 250000 coins
Collect 500000 coins
Complete 100 missions
Complete 500 missions
Kill Char the Drifter Prince.
Destroy Kievran the Killer.
Kill Commander Gremar.
Kill Ecrin the Bonecrusher.
Kill Kurush, son of the Old Ones.
Kill Arresh Naggar.
Complete your Fraternity of Shadows training.
Clear the Sewers of Hadrion.
Catch the traitor in the Fraternity of Shadows.
Rid the Upper City of zombies.
Complete a heroic mission in the Lower City.
Complete a heroic mission in the Fraternity's Lair.
Complete a heroic mission in Ursa's Castle.
Complete a heroic mission in the Bandit Lair.
Complete a heroic mission in Claehra Maertock.
Complete a heroic mission in the Sewers.
Complete a heroic mission in the Upper City.
Complete a heroic mission in the Prison of Despair.
Complete a heroic mission in the Magic Library.
Complete a heroic mission in the Temple of the Azures.