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