Completely destroy a giant asteroid and all resulting chunks without nukes

Survive a full day with the city shield offline

Survive for 7 days without taking any shield hits

Encounter and destroy an extremely rare enemy type

Reach the end of a day with an arsenal of 25 nukes before launching any

Launch 50 nuclear warheads (of any size) before the city falls

Destroy a giant floating invertebrate by any means

Destroy a bomber with a city-launched nuke during fly-over

Fail to be rewarded any performance bonuses for an entire day

Survive 5 consecutive days with the city shield offline

Survive 7 days without launching, buying or researching nuclear weapons

Encounter and destroy an ancient totem of demolition

Survive the first 2 weeks without taking any shield damage

Destroy an entire swarm of inter-dimensional anemones

Fund 4 research categories within the first week

Survive for 7 days without upgrading railgun fire rate

Intercept all enemy matter before impacting the ground for 5 consecutive days

Keep 2 drones long enough to end a day with 100+ kills each in their lifetime

Survive a day without destroying any enemies or debris using the city railgun or launched nukes

Feed a nullifier enough nuclear energy for it to burst, opening an inter-dimensional rift

Reach the end of the day with widespread radiation sickness and less than 1,000,000 population