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