SAS: Zombie Assault 4 achievements

Survive Survivors 1,000 times

Successfully escort the whiny VIP 1,000 times

Make 1,000 successful stands

De-worm 1,000 Regurgitators

Eviscerate 1,000 Devastators

Complete Power Out without any player on a 4 player team taking any damage from the central turrets

Terminate 1,000 Zombie Mechs

Apply 25 total skill points on a single character between Health Regen and Energy Regen (at least 5 points in each)

Apply 25 total skill points on a single character between Toughness and Body Armor Expert (at least 5 points in each)

Personally curb stomp 1,000,000 zombies

Vaporize 10,000 zombies with the Aerial Bombardment skill (Heavy Class)

Sell 5,000 weapons or gear pieces