There is only one minor missable achievement, [Aphrodite’s Embrace], which you are highly unlikely to miss unless you reject every possible romantic opportunity, which the game provides plenty of. This is an RPG with branching choices, but none of them really matter when it comes to achieving 100% completion.
There are some achievements that you will probably need to look up at certain points if you get stuck. These involve hunting all of the Cultists and Order of the Ancients enemies. While it is possible to discover them on your own since the game provides in game clues, it can be time consuming, as some clues do not clearly point you in the right direction.
Most achievements are straightforward and will come naturally by completing as many side quests and side activities as possible. This also applies to the DLC achievements. However, if you want to skip as many side quests as possible, you will likely need to look up a guide from time to time.
Complexity: ●●●○○
Difficulty: ●○○○○
Estimated Time: 110-145 hours
Achievements
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1 Versus 100
Defeat the Hekatonchires.
DLCDifficulty
A Brother's Seduction
Complete A Brother's Seduction
DLCStory
A Friend Worth Dying For
Complete A Friend Worth Dying For
DLCStory
A Pirate's Life for Me
Complete Xenia's questline.
Guide Optional
A Poet's Legacy
Complete A Poet's Legacy.
DLCStory
A True Ruler
Dethrone the king.
DLCStory
A-maze-ing Victory!
Defeat the Minotaur.
Fair
An Odyssey in the Making
Complete Episode 1.
Story
Aphrodite's Embrace
Spend the night with another character.
Missable
Are You Not Entertained?
Become Champion of the Arena.
Fair
Bad Dog!
Defeat Cerberos.
DLCStory
Birthright
Discover Atlantis and speak with Pythagoras.
Fair
Bittersweet Beginnings
Secure your bloodline
DLCStory
Blasphemer
Destroy all of the Marble Maiden Tributes.
DLCSimple
Blood Sport
Defeat a Mercenary in the Arena.
Fair
Blood of Leonidas
Continue the bloodline.
DLCStory
Breaking the Limit
Land a Rush Assassinate that chains 4 times with the Blade of the Lion
DLCSimple
Child of Poseidon
Complete all underwater location objectives.
Guide OptionalTedious
Demigod
Reach Level 50.
Simple
Democracy Falls
Complete Episode 6.
Story
Divine Intervention
Complete Divine Intervention.
DLCStory
Every Story Has an Ending
Complete Every Story Has an Ending
DLCStory
Everybody Benefits
Complete Markos's questline.
Fair
Evil Unearthed
Complete Episode 3.
Story
Eye on the Prize
Defeat the Cyclops.
Fair
Fashion's Creed
Equip a Legendary Armor set.
Simple
Fire on Water
Set 10 enemy ships on fire.
Fair
For Love of Persia
Kill all the Ancients in the Order of Dominion in Messenia
DLCGuide Optional
From the Ashes
Complete Episode 5.
Story
Gathering Full Strength
Collect all the Keeper's Insights in Episode 3.
DLCSimple
Gathering More Strength
Collect all the Keeper's Insights in Episode 2.
DLCFair
Gathering Strength
Collect all the Keeper's Insights in Episode 1.
DLCFair
Godly Power
Acquire a Tier 3 active Ability.
Fair
Going For Gold
Complete the Olympic questline.
Fair
Guardian of the Underworld
Close all Tartaros Rifts.
DLCFair
Harder, Better, Faster, Stronger
Upgrade the Adrestia for the first time.
Simple
Hephaistos's Apprentice
Forge the 3 Legendary Weapons.
DLCFair
Hermes's Homie
Unveil all sub-regions of Greece.
Fair
Hero for Hire
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Simple
I Have the Power
Perform an Overpower Attack with every weapon type.
Simple
I am Legend
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Simple
In Perseus's Image
Defeat Medusa.
Difficulty
In the Face of the Gods
Remember who you are.
DLCStory
Infamous
Raise your Bounty to the maximum level.
Fair
Island Hopper
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Simple
Isu Bloodline
Completely fill the Knowledge Sequence.
DLCFair
Kingmaker
Acquire the Sword of Kings
DLCGuide Optional
Legacy Restored
Upgrade your Spear to Tier 6.
Simple
Legend in the Making
Complete Episode 7.
Story
Lightning Rod
Defeat Steropes the Lightning Bringer.
Fair
Lone Lion
Kill the Makedonian Lion
DLCGuide Recommended
Lord of the Seas
Upgrade the Adrestia to Legendary Status.
Tedious
Make It Your Own
Engrave your first item.
Simple
Master of the Hunt
Complete the Daughters of Artemis questline.
Difficulty
Misthios in Training
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Simple
No More Rulers
Kill all Overseers in Elysium.
DLCFair
Odyssey's End
Complete Episode 9 + Epilogue.
Story
Old Flames Burn Brighter
Complete Old Flames Burn Brighter
DLCStory
One Head Down…
Defeat a full cluster of Cultists of Kosmos.
Simple
One Really, Really Bad Day
Complete One Really, Really Bad Day
DLCStory
Parry to Carry
Heal by parrying 10 times with the Judgment of the Lion.
DLCSimple
Past Mistakes
Complete Episode 2.
Story
Predator and Prey
Kill all the Ancients in the Order of the Hunters in Makedonia
DLCGuide Optional
Rain of Arrows
Kill 10 enemies using the Rapid Fire ability.
Simple
Ramming Speed
Cleave a ship in half.
Simple
Riddle Me This
Outwit the Sphinx.
Guide Optional
Scourge of the Aegean
Sink your first Epic Ship.
Simple
Seeing Red
Kill 10 enemies using the Fury of the Bloodline Ability.
Simple
Shiny!
Acquire and equip your first Legendary item.
Simple
Stink Eye
Recover the Cyclops's eye from a goat on Kephallonia.
Fair
Stormculler
Kill all of the Ancients in the Order of the Storm in Achaia.
DLCGuide Optional
Surgical Sniper
Heal by getting 10 headshot kills while you have the Golden Harbinger equipped.
DLCSimple
Taking Back Athens
Complete Episode 8.
Story
The Argonauts
Fully crew the Adrestia with Legendary Lieutenants.
Fair
The Bright Minds
Complete Episode 4.
Story
The Conqueror
Win the conquest of Elysium with freed humans from the 3 main regions.
DLCSimple
The Cult Unmasked
Defeat all the Cultists of Kosmos.
Guide Recommended
The Daughters of Lalaia
Complete The Daughters of Lalaia
DLCStory
The Heir of Memories
Complete The Heir of Memories
DLCStory
The Image of Faith
Complete The Image of Faith
DLCStory
The Midas Touch
Engrave a Legendary Item with a Legendary Effect.
Fair
The One
Defeat all of the Fallen.
DLCGuide Optional
The Show Must Go On
Complete The Show Must Go On.
DLCStory
The Start of a Legacy
Discover the truth about Darius' past
DLCStory
This is Sparta!
Complete the Battle of 300.
Story
Top of the Food Chain
Become the first Mercenary.
Tedious
Trust Me, I'm a Doctor
Complete the Hippokrates questline.
Guide Optional
Volcanic Sunscreen
Defeat Arges, the Bright One
DLCFair
War Master
Kill the Leader of any Region with Low Resources, other than Megaris.
Simple
Without a trace
Kill 10 enemies using the Death Veil ability
Fair
Wrath of the Amazons
Cleave a ship while having an all-women crew.
Fair
You Work for Me Now
Recruit and assign a Legendary NPC for your ship.
Fair
Your Own Medicine
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
DLCSimple
Review
The game’s biggest flaw is that it is called Assassin’s Creed. Stealth gameplay is the game’s weakest aspect. For what it is worth, it is still an above average RPG experience. The base story and side quests are interesting. Combat is enjoyable, although it may not be what you expect from an Assassin’s Creed game.
The game does not hold up as well the longer it goes on, but the base story remains a solid experience. Greece is beautiful but some locations can get repetitive.