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