Got it, thanks all. I couldn’t find anything explaining this. Page 40 of the rulebook, under "Achievments"
The achievement system is the main way that players will keep track of major changes in the world and
what scenarios a particular party has access to while playing in campaign mode. There are two types of
achievements: global achievements and party achievements.
Global achievements affect the entire game world, regardless of what party is playing in it. Global
achievements are tracked with stickers along the top of the world map . Some global achievements have a
specific type (listed after the achievement in the format of “Type: Achievement,” e.g., “City Rule: Militaristic”).
Only one global achievement of each type can be active at a time. If a global achievement is gained and there is
already an active achievement of the same type, the previous achievement is overwritten and the new sticker is
placed on top of the previous one. Multiple instances of a single global achievement are possible, so long they
don’t have a specific type.
Party achievements are tied to a specific party and are mainly used
to keep track of what scenarios are available to play in campaign
mode for that party.
When in doubt, check the rulebook.