Also including the Hybrid affinities from the Rising Tide expansion.EXPLANATION FOR PEOPLE WHO DON'T PLAY CIV:BE
In Civilization: Beyond Earth, all players have three Affinities that are gained from quest decisions, technologies and rare excavation finds. Each Affinity has a unique aesthetic and resource and over time grant the player access to buildings, units, cosmetic upgrades and eventually one of three Affinity based winning conditions
The Harmony Affinity is centered around living in harmony with the wildlife of the alien planet and incorporating alien genes into technology and people and its resource is Xenomass, an organic substance with many biotech applications. The Harmony victory is Transcendence, where humanity successfully merges with the alien hive intelligence.
The Purity Affinity has the least dramatic changes to the human body, instead focusing on preserving the legacy of Earth. Its technology is based around terraforming and surviving alien worlds without sacrificing their humanity and its resource is Floatstone, a large scale magnetic monopole. The Purity victory is The Promised Land, where the people of Earth are successfully transported to a new homeworld.
The Supremacy Affinity is based around robotics and cybernetic modification to the human body and its resource is Firaxite (subtle), a mineral whose properties are excellent for quantum computing. The Supremacy victory is Emancipation, where Earth is invaded to save humanity from their fundamental mortality.
In the Rising Tide expansion, three new hybrid Affinities were added. These also grant their own units, but are not dependent on new resources and do not have a unique victory of their own.
Harmony/Purity is based around optimizing the human genome with alien genes instead of complete hybridization.
Purity/Supremacy avoids direct augmentation and instead works on using AI to benefit their human overlords.
Supremacy/Harmony is the most drastically transhuman of all the Affinities, incorporating both biotech and machiner in their modifications.