Full list of all 93 Assassin's Creed Odyssey achievements. It takes around 80-100 hours to unlock all of the achievements in the base game on Windows.
The base game contains 50 achievements, and there are 5 DLC packs containing 43 achievements.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Complete all underwater location objectives.
Unveil all sub-regions of Greece.
Complete Xenia's questline.
Complete the Hippokrates questline.
Perform an Overpower Attack with every weapon type.
Complete Markos's questline.
Recover the Cyclops's eye from a goat on Kephallonia.
Upgrade the Adrestia to Legendary Status.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Defeat Medusa.
Fully crew the Adrestia with Legendary Lieutenants.
Upgrade your Spear to Tier 6.
Defeat all the Cultists of Kosmos.
Cleave a ship while having an all-women crew.
Defeat the Minotaur.
Reach Level 50.
Become Champion of the Arena.
Defeat a full cluster of Cultists of Kosmos.
Defeat a Mercenary in the Arena.
Become the first Mercenary.
Defeat the Cyclops.
Engrave a Legendary Item with a Legendary Effect.
Equip a Legendary Armor set.
Complete Episode 9 + Epilogue.
Acquire a Tier 3 active Ability.
Complete Episode 8.
Complete the Daughters of Artemis questline.
Complete Episode 7.
Outwit the Sphinx.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Recruit and assign a Legendary NPC for your ship.
Complete the Olympic questline.
Discover Atlantis and speak with Pythagoras.
Kill the Leader of any Region with Low Resources, other than Megaris.
Complete Episode 6.
Complete Episode 5.
Complete Episode 4.
Sink your first Epic Ship.
Raise your Bounty to the maximum level.
Complete Episode 3.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Spend the night with another character.
Upgrade the Adrestia for the first time.
Complete Episode 2.
Acquire and equip your first Legendary item.
Cleave a ship in half.
Complete Episode 1.
Engrave your first item.
Complete the Battle of 300.
Heal by parrying 10 times with the Judgment of the Lion.
Kill 10 enemies using the Rapid Fire ability.
Land a Rush Assassinate that chains 4 times with the Blade of the Lion
Kill the Makedonian Lion
Kill 10 enemies using the Death Veil ability
Heal by getting 10 headshot kills while you have the Golden Harbinger equipped.
Acquire the Sword of Kings
Kill all of the Ancients in the Order of the Storm in Achaia.
Kill all the Ancients in the Order of Dominion in Messenia
Kill all the Ancients in the Order of the Hunters in Makedonia
Secure your bloodline
Set 10 enemy ships on fire.
Continue the bloodline.
Discover the truth about Darius' past
Kill 10 enemies using the Fury of the Bloodline Ability.
Complete Old Flames Burn Brighter
Complete Every Story Has an Ending
Complete The Heir of Memories
Complete A Poet's Legacy.
Complete A Brother's Seduction
Complete Divine Intervention.
Complete The Daughters of Lalaia
Complete The Image of Faith
Complete The Show Must Go On.
Complete A Friend Worth Dying For
Complete One Really, Really Bad Day
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
Defeat the Hekatonchires.
Forge the 3 Legendary Weapons.
Collect all the Keeper's Insights in Episode 3.
Completely fill the Knowledge Sequence.
Close all Tartaros Rifts.
Destroy all of the Marble Maiden Tributes.
Dethrone the king.
Collect all the Keeper's Insights in Episode 2.
Defeat all of the Fallen.
Defeat Cerberos.
Win the conquest of Elysium with freed humans from the 3 main regions.
Collect all the Keeper's Insights in Episode 1.
Kill all Overseers in Elysium.
Remember who you are.
Defeat Arges, the Bright One
Defeat Steropes the Lightning Bringer.