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