
You can pick one that you want to designate as the Imperial Core and push them towards this goal.
#SIMAIRPORT ACHIEVEMENTS CHECKLIST FULL#
When you host/join a multiplayer game, you are given the full list of empires to control.

You can host your singleplayer game in a multiplayer session. Avoid making claims (and give up exisiting claims), as the "demanding unoccupied system/planet" surrender acceptance malus applies, despite the fact that you cannot conquer systems with this war goal and casus belli. Be ready to fight the Emperor and any loyalists (which can be everyone except you and your vassals). You can also use an operation to lower imperial authority if envoys are not enough. When it is low enough, use your spy to start the rebellion. Once the Imperium has been proclaimed, assign envoys to undermine imperial influence. Support their nomination and any term extensions, but veto the creation of the Galactic Defense Force. Once a suitable AI empire nominates itself, start building a spy network on them. Ideally, an authoritarian empire nominates itself, as they are more likely to proclaim the Galactic Imperium later.
#SIMAIRPORT ACHIEVEMENTS CHECKLIST FREE#
Either veto or quickly pass any resolutions by other council members to free their proposal slots. Wait for a crisis to trigger and contain it but don't let it be destroyed. Increase the council size to 5 (the maximum) and enable veto power. When you win the AI is forced out of the Supremacist Diplomatic Stance and the achievement is obtained.

When it changes to Supremacy build up your fleet to equivalent power and when ready, verify that the AI's diplomatic stance still shows Supremacy and then send envoys to harm relations, rival the AI, and declare a humiliation war.

Play normally, find the AI, send envoys to improve relations (to discourage it from declaring war on you) and monitor the AI's diplomatic stance.

The "DI" column is for difficulty as assessed by wiki editors. Achievements cannot be earned prior to the version they were added in. The "Ver" column indicates in which version a certain achievement was added. If an achievement requires the existence of another empire just create sectors and then turn them into vassals. This way achievements can be completed at your leisure. The easiest way to earn most achievements is to start a game without AI empires and maximum number of habitable worlds.
