Complete one of the following achievements to collect their Xbox Live Gamerscore points:
Unlockable: --- How to Unlock:
A Moral Victory (100 GP) --- Finished the game without a single kill or knockout
All That Glitters (15 GP) --- Stole 5 collectibles
Cache Dispenser (100 GP) --- Used 40,000 gold
Child of the Shadows (10 GP) --- Finished a single chapter without alerting anyone
Clear Headed (30 GP) --- Reached the final chapter without using the focus ability
Dark Archer (20 GP) --- Completed 10 optional Thieving Objectives
Dastardly Deeds (80 GP) --- Completed all Basso Jobs in The City
Finders Keepers (40 GP) --- Discovered all secret areas
Focus on the Tasks at Hand (5 GP) --- Picked a pocket and a lock using the focus ability
Hail of Glass (10 GP) --- Shot a bottle in mid-air with an arrow
Hard Times (60 GP) --- Finished the game on Master difficulty
Health Hazard (25 GP) --- Killed or knocked out 10 people using the environment
Hidden Agenda (20 GP) --- Discovered 15 secret areas
Legend in Leather (75 GP) --- Completed 25 optional Thieving Objectives
Mint Condition (10 GP) --- Finished 3 consecutive chapters without taking damage
Modesty Denied (30 GP) --- Scored an epic 5,000,000 or more in a Challenge Map
More Heist Less Speed (30 GP) --- Finished the game in 15 hours or more
Obsessive Compulsive (5 GP) --- Stole all loot and collectibles in a single chapter.
One Step Ahead (20 GP) --- Disarmed ten trap mechanisms
Priceless (20 GP) --- Completed a collectible set
Quickly Pick a Lucky Lock (10 GP) --- Picked a lock with masterful speed
Sleight of Hand (20 GP) --- Picked 100 pockets in a single playthrough
Something to Prove (100 GP) --- Finished the game with a custom difficulty of 700 points or more
What's Yours is Mine (40 GP) --- Completed all collectible sets
Working Overtime (40 GP) --- Completed all Client Jobs in The City
Complete one of the following Secret achievements to collect their Xbox Live Gamerscore points:
Unlockable: --- How to Unlock:
A Friend in Need (5 GP) --- Finished Chapter Four.
A Man Apart (5 GP) --- Finished Chapter Six.
Dirty Secrets (5 GP) --- Finished Chapter Three.
Dust to Dust (5 GP) --- Finished Chapter Two.
Happy Birthday (15 GP) --- Sweet sixteen. Snuff said.
Lockdown (5 GP) --- Finished Chapter One.
Old Habits Die Hard (10 GP) --- Found all the secret stashes in Moira.
The Dawn's Light (15 GP) --- Finished Chapter Eight.
The Drop (5 GP) --- Finished the Prologue.
The Forsaken (5 GP) --- Finished Chapter Five.
The Hidden City (5 GP) --- Finished Chapter Seven.
Two Faced (5 GP) --- Uncovered Lyegrove's secret.
Easy "Two-Faced" Achievement
Go into the Stonecutter's Court then discover the Jewelry Store to the left of the guards that are speaking with each other, standing in the light. Go into the store, knock out the guard to the left of the entryway and then turn to the right. Discover the 3 cabinets below the red drapes. Use a lockpick on the center cabinet to obtain the very first mask. Turn around and slip into the cellar. Stay clear of the individual working at the desk while transferring to the rear left corner of the workshop. Interact with the painting and use the secret switch to unlatch it to discover a wall safe. Enter the code "739" to open the safe and gather the other item.