Here is the full list of all 73 Ryse: Son of Rome achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Complete False Gods.
Complete Invictus.
Unlock The First Reward Of The Gods.
Complete Beacon.
Revive Another Player 3 Times.
Complete Barbarous.
Defeat 100 Enemies In Multiplayer.
Perform 50 Double Executions In Any Game Mode.
Play A Round Of Survival On Island.
Perform A Co-op Execution.
Complete Your First Multiplayer Campaign.
Play A Round Of Survival Mode.
Complete The Game On Centurion Difficulty.
Collect All The Chronicles.
Collect All The Vistas.
Complete A Comic Book By Collecting 6 Chronicles In A Level.
Use An Execution To Set Fire To An Enemy.
Collect One Chronicle.
Replay Any Single Player Level.
Complete The Game on Any Difficulty.
Complete The Game On Soldier Difficulty.
Complete The Son Of Rome On Any Difficulty.
Defeat Boudica.
Use A Trap To Kill An Enemy.
Complete The Wrath Of Nemesis On Any Difficulty.
Defeat Commodus.
Become The Righteous Hand Of Vengeance.
Complete Pax Romanum On Any Difficulty.
Find Out What Really Happened To Your Parents.
Complete Edge Of The World On Any Difficulty.
Defeat Glott.
Complete The King On Any Difficulty.
Meet Boudica.
Kill An Enemy By Perfectly Deflecting An Arrow.
Complete Trial By Fire On Any Difficulty.
Collect Your First Vista.
Perform 100 Executions In Any Game Mode.
Complete S.P.Q.R. On Any Difficulty.
Defeat 10 Enemies In A Row Without Sustaining Any Damage.
Collect One Scroll.
Find Your Mother And Sister.
Perform Your First Environmental Execution.
Complete The Beginning On Any Difficulty.
Purchase And Use An Upgrade In Combat.
Meet Nero.
Perform Your First Combat Execution.
Defeat 25 Enemies In A Row Without Sustaining Damage.
Complete The Beginning On Legendary Difficulty.
Complete S.P.Q.R. On Legendary Difficulty.
Complete Trial By Fire On Legendary Difficulty.
Complete The King On Legendary Difficulty.
Complete Edge Of The World Legendary Any Difficulty.
Complete Pax Romanum On Legendary Difficulty.
Complete The Wrath of Nemesis On Legendary Difficulty.
Complete The Son Of Rome On Legendary Difficulty.
Collect All The Scrolls.
Get In Combat With All Executions And Upgrades Purchased.
Complete 20 Multiplayer Campaigns.
Fight On Each Multiplayer Arena Environment.
Achieve Rank 100 In Multiplayer.
Unlock All The Rewards Of The Gods.
Equip Your First Rare Item In Multiplayer.
Equip Your First Tier 2 Item In Multiplayer.
Equip Your First Tier 5 Item In Multiplayer.
Equip Your First Tier 6 Item In Multiplayer.
Survive For 7 Minutes In Courtyard (Survival Mode).
Survive For 7 Minutes In Firestorm (Survival Mode).
Survive For 7 Minutes In Dockyard (Survival Mode).
Achieve Rank 150 In Multiplayer.
Perform 30 Environmental Executions On Island.
Perform 30 Environmental Executions In Forbidden Forest.
Achieve Rank 200 In Multiplayer.
Perform 1000 Executions In Multiplayer.