Here is the full list of all 37 THIEF achievements worth 1,000 gamerscore. It takes around 40-50 hours to unlock all of the achievements on Xbox One.
Shot a bottle in mid-air with an arrow
Found all the secret stashes in Moira
Used 40,000 gold
Completed all collectible sets
Picked 100 pockets in a single playthrough
Killed or knocked out 10 people using the environment
Picked a pocket and a lock using the focus ability
Scored an epic 5,000,000 or more in a Challenge Map
Finished the game with a custom difficulty of 700 points or more
Finished the game without a single kill or knockout
Reached the final chapter without using the focus ability
Stole all loot and collectibles in a single chapter.
Finished the game on Master difficulty
Completed all Client Jobs in The City
Completed all Basso Jobs in The City
Completed a collectible set
Picked a lock with masterful speed
Finished 3 consecutive chapters without taking damage
Completed 10 optional Thieving Objectives
Uncovered Lyegrove's secret
Finished Chapter Eight
Finished the game in 15 hours or more
Finished Chapter Seven
Finished Chapter Six
Disarmed ten trap mechanisms
Finished Chapter Five
Finished Chapter Four
Discovered 15 secret areas
Finished Chapter Three
Finished a single chapter without alerting anyone
Sweet sixteen. Snuff said.
Stole 5 collectibles
Finished Chapter Two
Finished Chapter One
Finished the Prologue
Complete 25 optional Thieving Objectives
Discover all secret areas