SAS: Zombie Assault 4 achievements

Squish 5,000 zombies while driving a vehicle

Successfully complete Recovery 100 times

Complete Recovery without ever entering a vehicle

Crush a boss zombie while driving a vehicle

Flatten 20 zombies with a single drift

Extinguish 1,000 Wickers

De-worm 1,000 Regurgitators

Successfully defend the ship 1,000 times

Terminate 1,000 Zombie Mechs

Successfully escort the whiny VIP 1,000 times

Open 10,000 Strongboxes

Eviscerate 1,000 Devastators