Full list of all 102 Galactic Civilizations III achievements. It takes around 200 hours to unlock all of the achievements in the base game on Windows.
The base game contains 62 achievements, and there are 7 DLC packs containing 40 achievements.
Win on an Insane sized map
Win as Drath
Use 20 Artifact Powers in a single game
Play for 100 hours across all games
Win as Korath
Win as the Krynn
Use the spore weapon
Build a hyperlane
Use an Artifact Power
Build a hypergate
Ascension victory
Technology Victory
Win as the Iridium
Win by Diplomacy
Win as the Yor
Destroy the Iconian faction, as the Yor
Win as the Iconian
Ally with first other major faction
As the Iconians, take back Iconia (Yor's starting homeworld) from the Yor
Win as the Drengin
Win a game in under 200 turns
Declare war before you have Universal Translator
Win by Conquest
Win as the Altarian
Control all Relics on the map
Win the campaign
Use a Worm Hole
Start the campaign
Own 30 planets
Have 12 or more Trade Routes
Win as the Terran
Win by Cultural Influence
Destroy more than 15 enemy ships in a battle
Create your first ship design
Destroy an Enemy Faction
Play for 5 hours across all games
Survey an anomaly in a dust cloud or nebula
Collect 15 Anomalies in a game
Meet your first Race in Galactic Civilizations III
Colonize your first planet
Win a Battle
Play for 1000 Hours
Win as the Thalan
Win in Multiplayer
Win as a Custom Faction
Recapture your homeworld
Unlock all the Benevolent ideology traits
Unlock all the Pragmatic ideology traits
Unlock all the Malevolent ideology traits
Use Core Detonation invasion 10 times in one game
Be at war with 5 different factions at the same time
Destroy more than 7 Pirate bases
Win as the Mu'Kay
Win as Mowlings
Win as Free Trandals
Win as the Tywom
Build 20 hyperlanes in a single game
Win the Retribution campaign
Win as Xraki
Win as Measured
Win as Scryve
Win as Phamysht
Complete the Snathi Campaign
Win as Snathi
Win as Torians
Win as Arceans
Complete the Mercenaries campaign
Sell at least 30 resources at once
Buy at least 10 resources at once
Buy at least 30 resources at once
Create a commonwealth
Sell at least one resource on the marketplace
Sell at least 10 resources at once
Complete "The Simulation" Crisis
Assign a Crisis manager
Complete "The Revolution" Crisis
Raise your taxes to 100% for one turn
Lower your taxes to 0% for one turn
Buy at least one resource on the marketplace
Complete "Apophis" Crisis
Win an Election with a landslide majority
Complete "Brain Parasites" Crisis
Change your government type
Win an Election
Complete "Space Monster" Crisis
Successfully complete a Crisis
Change your tax slider for one turn
Form a government
Complete "Rogue General" Crisis
Complete "Secession" Crisis
Complete "Brain Trust" Crisis
Place a spy on a foreign colony.
Unleash a custom Civilization on the Galaxy.
Win Game playing the Slyne.
Promote your first Specialist.
Conquer a planet defended by enemy Legions.
Complete the Crusade Tutorial.
Train your first Citizen.
Win Game playing the Terran Resistance.
Win Game playing the Onyx Hive.
Complete the Altarian Prophecy Campaign
Complete the Rise of the Terrans campaign