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