Survive 5 consecutive days with the city shield offline
Survive 7 days without launching, buying or researching nuclear weapons
Destroy a giant floating invertebrate by any means
Reach the end of a day with an arsenal of 25 nukes before launching any
Survive a full day with the city shield offline
Destroy a bomber with a city-launched nuke during fly-over
Survive for 7 days without taking any shield hits
Fail to be rewarded any performance bonuses for an entire day
Encounter and destroy an extremely rare enemy type
Launch 50 nuclear warheads (of any size) before the city falls
Completely destroy a giant asteroid and all resulting chunks without nukes
Encounter and destroy an ancient totem of demolition
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