Here is the full list of all 18 PeriAreion achievements.
Complete sustainability conditions on the "Casual" difficulty setting.
Complete sustainability conditions on the "Normal" difficulty setting.
Complete sustainability conditions on the "Hard" difficulty setting
Build the level every level 4 module
Purchase every upgrade in the Agriculture research tree
Purchase every upgrade in the Geology research tree
Purchase every upgrade in the Medical research tree
Specialize your base as a Residential Colony
Specialize your base as a Commercial Outpost
Specialize your base as a Research Station
Complete 5 photo opportunities on any map
Unlock all the PeriAreipedia articles
Have 7 or more colonists on Mars at one time
Have all 21 colonist on Mars at one time
Hit a colonist with the rover
Have a colonist die while sick
Kill all of your colonists
Play a game with the Canadian colonist