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