Here is the full list of all 20 Ghost of a Tale (Windows) achievements worth 1,000 gamerscore.
Escape Tilo's cell
Discover Duinlan’s tomb.
Rid Dwindling Heights of all spiders.
Reach the desolate shore.
Reach the end of the game.
Gusto and Fatale Complete all of Gusto and Fatale's quests.
Finish every secondary quest.
Complete the full set of Duinlan's armour.
Gather fifty-five mushrooms.
Set fire to all inflammable items in Dwindling Heights.
Complete the game without getting hit by an enemy.
Complete the game without ever eating to regain energy.
Learn all skills in the adventure.
Complete the game without alerting any guards.
Unlock forty-five footnotes.
Discover the name of every possible character in Dwindling Heights.
Steal all of the Rat Guards' handkerchiefs.
Open all window shutters.
Play all songs during the course of the game.
Reach the highest point in the highest tower.