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