Hero

Hero is an achievement in Sas: Zombie assault 4 or simply SAS 4. It is obtained by having all the survivors in the mission Survivors be rescued. There are a total of 60 people to rescue. It is fittingly name as you save many people. It rewards 75 AP (awesome points) being a gold achievement. The picture of the achievement is a [fill in].

Tactics
It is usually best in single player, as the zombies are much weaker and easier to kill. However, multiplayer is easier if you have a cooperative  team for four players, and go to one door at once. Generally, have at least one player guarding the door so zombie do not come in and kill any survivors. Have the team stay together  ensure doors are not opened by zombies. If anyone dies, wait for them to revive/heal to full health by medkits from a Medic. Make sure no one is trying to get Zero, the exact opposite of this achievement and much easier. It requires you to let all survivors die instead of live and is a hidden achievement.