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