Complete the following achievements to unlock Xbox Live Gamerscore points.

Head Executioner (10 points): Perform 100 Executions in Any Game Mode.
I Will Avenge You, Father (30 points): Complete S.P.Q.R. On Any Difficulty.
Roman Tourist (10 points): Collect Your First Vista.
Letters From The Front (10 points): Collect One Scroll.
Comboing My Way Through (20 points): Defeat 10 Enemies In A Row Without Sustaining Any Damage.
I Have A Story To Tell (30 points): Complete The Beginning On Any Difficulty.
Time To Fly (5 points): Perform Your First Environmental Execution.
Give Caeser What Is His (10 points): Purchase And Use An Upgrade In Combat.
First Blood (5 points): Perform Your First Combat Execution.
Double-Down (10 points): Perform 50 Double Executions in Any Game Mode.
Photo Album (15 points): Collect All The Vistas.
Ancient Scholar (15 points): Collect All The Scrolls.
Colosseum Recruit (20 points): Complete Your First Multiplayer Campaign.
Saving Private Marius (30 points): Complete Trial By Fire On Any Difficulty.
Trouble In Sherwood Forest (30 points): Complete The King On Any Difficulty.
Heart of Darkness (30 points): Complete Edge Of The World On Any Difficulty.
Siege Me If You Can (30 points): Complete Pax Romanum On Any Difficulty.
Ave, Caesar (30 points): Complete The Wrath Of Nemesis On Any Difficulty.
Settling Old Debts (30 points): Complete The Son Of Rome On Any Difficulty.
Veni, Vidi, Vici (30 points): Complete The Game on Any Difficulty.
Something I Found On The Way To The Forum (10 points): Collect One Chronicle.
Finders Keepers (15 points): Collect All The Chronicles.
I Have A Story To Tell (Legendary) (5 points): Complete The Beginning On Legendary Difficulty.
Ave, Caesar (Legendary) (5 points): Complete The Wrath of Nemesis On Legendary Difficulty.
Grace Of The Gods (10 points): Unlock The First Reward Of The Gods.
Champion Of The Gods (20 points): Unlock All The Rewards Of The Gods.
Colosseum Warrior (20 points): Fight On Each Multiplayer Arena Environment.
Been There, Done That (5 points): Replay Any Single Player Level.
Avid Reader (10 points): Complete A Comic Book By Collecting 6 Chronicles In A Level.
Only The Finest (5 points): Equip Your First Rare Item in Multiplayer.
Son Of Vulcan (10 points): Equip Your First Tier 5 Item In Multiplayer.
It's Just A Flesh Wound (10 points): Revive Another Player 3 Times.
Marketer (20 points): Get In Combat With All Executions And Upgrades Purchased.
I Will Avenge You, Father (Legendary) (5 points): Complete S.P.Q.R. On Legendary Difficulty.
Saving Private Marius (Legendary) (5 points): Complete Trial By Fire On Legendary Difficulty.
Trouble In Sherwood Forest (Legendary) (5 points): Complete The King On Legendary Difficulty.
Heart of Darkness (Legendary) (5 points): Complete Edge Of The World Legendary Any Difficulty.
Siege Me If You Can (Legendary) (5 points): Complete Pax Romanum On Legendary Difficulty.
Settling Old Debts (Legendary) (5 points): Complete The Son Of Rome On Legendary Difficulty.
Bad To The Bone (30 points): Complete The Game On Centurion Difficulty.
My Empire Of Dirt (50 points): Complete The Game On Soldier Difficulty.
Colosseum Veteran (20 points): Complete 20 Multiplayer Campaigns.
Simply The Best (20 points): Achieve Rank 100 in Multiplayer.
Say Hello To My Little Friend! (5 points): Equip Your First Tier 2 Item in Multiplayer.
Brother In Arms (10 points): Perform A Co-op Execution.
Bloody Centurion (15 points): Defeat 100 Enemies in Multiplayer.
Monstrum Combo (20 points): Defeat 25 Enemies In A Row Without Sustaining Damage.