Complete all of the main quests

Beat the factory mission on the hardest difficulty

Survive the electric generator challenge

Beat the AI graveyard mission on the hardest difficulty

Beat the hospital mission on the hardest difficulty

Defeat a goliath drone in the acid mines

Defeat ten thousand enemies of any kind

Defeat a giant mutant zombie flying centipede that can appear over the field

Defeat the mutant zombie flying eel that can appear over the field

Defeat a fierce mutant zombie flying shark that can appear over the field

Defeat one of the mutant zombie flying squids that can appear over the field

Defeat the big Field Hulk roaming near the warp gate

Defeat a dangerous husk that can appear in the hospital

Defeat a sand worm near the warp gate

Defeat one of the huge flying zombie bugs that appears near the warp gate

Find all of the golden collectibles

Find a mod

Defeat one hundred enemies in a row without taking a single point of damage or using the carnage rifle

Defeat the AI graveyard mission boss without using the portable weapon available at the start of the mission

Defeat a zombie using a monster truck

Enter the huge warpgate down the field

Hop on one of the giant slugs that can appear in the field

Launch a zombie into the clouds with a melee weapon

Upgrade a mod item to improve its stats