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