ENDLESS Space - Definitive Edition
93 Achievements
GOG
Cleansing the Galaxy
As the Harmony, purify 10 systems in a game
1.5%
How to unlock the Cleansing the Galaxy achievement in ENDLESS Space - Definitive Edition - Definitive Guide
Koleriker
TrueSteamAchievements
TrueSteamAchievements
Purifying a system simply requires you to build the improvement "Contamination Barrier". To be able to build that, you need to research "Personal shielding", which is about 60% through the military tech-tree.
