The Trespasser Add-on for Dragon Age: Inquisition has 11 achievements worth 240 gamerscore.
Progress the story to unlock.
Unlock all caches watched over by ancient statues.
Find all of the wearable items that make up the Taken Shape.
Travel Light on for "In Hushed Whispers": finish the quest.
Fair-Weather Friends always on: enter Halamshiral with all followers.
Rub Some Dirt on It on: slay the Hivernal high dragon.
Slay 10 great bears promoted by Grizzly End.
Defeat 20 foes promoted by Walk Softly.
Even Ground on: slay a level 16 or higher Fereldan Frostback.
Rest Easy trial always on in Emprise du Lion: claim Suledin Keep.
Take It Slow on: reach Skyhold at level 5 or less.