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