Complete the following achievements to unlock Xbox Live Gamerscore points.
Complete the following achievements to unlock Xbox Live Gamerscore points.
You can counter an incoming grab by blocking. This is only effective if you have enough health and against grabs from the front.
After knocking the "radio transmitter", you have to kill all marines in the area then go through a gate. After this, your objective is to enter a building with an unarmed civilian inside. To do this, you have to find a vent between two buildings. Start at the main gate where the electrical fence is broke. There are two buildings on the right. The vent is between the two little buildings that create an alley. The vent is at the start of that alley. Note: If you go to the end of that alley, you can turn left at which point a turret will shoot you, or turn right to find a wall that leads to the main gate and the generator. Once inside the vent, follow it to an very small vent with smoke coming out of it. Use it to enter the building.
When in the sewers you will eventually reach a large room with giant fans. Kill every Marine in the fan room and harvest the civilian. The objective marker should now appear. It is a circuit breaker that cuts off power to the fans. Destroy it, then go up the fan shaft to the next objective marker.
Perform a head bite on an already dead Marine to fully restore your health.