Call of Duty: Black Ops

There are three ways to get this trophy.

Campaign mode: During the battle of Khe Sanh when the NVA are pouring out of the tunnels in the background, throw grenades into the crowd. You are bound to kill some of them.
Multiplayer: Get five of your friends to join the other side. Tell them to cram together, then toss a frag grenade.
Zombies: This requires two players. Blow the legs off five zombies and have the other player to stand in one place while the zombies crawl towards them. When they are all attacking your friend, throw a frag grenade.

In the Rebirth labs, fire the China Lake into the central chamber of the lab. Once the explosion happens in the chamber, the Nova 6 will not only kill the soldiers, but all of the monkeys as well.

In Dead Ops mode, wait until you get to a higher round (for example, rounds 8 or 10). Use a meat power-up at the start of the round. When they pour in, wait a bit, then use the speed power-up.

On "The Defector" mission, at the part where you go inside the building with Bowman, Reznov, and Woods, (the one where the man is crying over his dead friend), go upstairs. There will be two VC in front of you and three more behind the window next to them. Aim precisely so that you can kill all three of them in one shot. This is a checkpoint. If you miss, kill yourself and try again.

Find and activate the following three hidden meteorites. The first meteorite can be found in the starting area. It is on a canister forward slightly and to the left near where you start. To get the second meteorite, get 750 points to open the path on the right of the starting area, that faces the lake. Go upstairs, and ignore the next blockade. Go around the side to enter a room that contains tables. You can find the meteorite on the seat at the far side of the room. Get 750 points to open the path on the left of the starting area. Reach the lighthouse, then take a right and go downstairs. Enter the room and go to where the light is located at the end. The meteorite is on the floor. Collect it, and "I'm Not Ready To Die" by Avenged Sevenfold will begin to play.

Wait until a zombie drops the "Death Machine" perk and be near George when you pick it up. Shoot at him as much as possible. Because the Death Machine has unlimited ammunition for a short time, this will deal a great deal of damage to Romero. Even if you pull him into the water and he returns to normal, this will still cause damage. It will require a very large amount of damage to defeat him. You do not necessarily need to turn the power on or kill him near the water; just as long as you keep doing damage to him, any weapon will bring him down. You will notice that his light hammer turns from blue to orange when you are close to defeating him.

If you lead a group of zombies into the water, keeping them in there long enough will cause them to freeze for a moment, allowing you to run away or kill them easier.

The easiest way to fight George is not to fight him. Shooting him, blowing him up, and even knifing him will cause him to roar in fury, then charge at full sprint after you and your allies until everyone is dead. If this occurs, you can lead him to any large body of water to calm him down. Until you obtain the new wonder weapon and upgrade it via pack-a-punch, you will not be able to kill him. Also, the power must be active before you can damage him.

The following perks are available: Double Tap, Juggar-naught, Speed Cola, Stamin-Up, Dr. Phlopper, Quick Revive, and Deadshot. The Deadshot perk lets you snap-aim (holding down your ADS while an enemy is near) to the zombie's head instead of its torso.

The power switch is located on the half-sunken ship to your right when you start. The boat that covers the entrance is 500 points. When you go up the ship's side, continue straight until you see a stairway to your left leading upstairs. It is worth 750 points to enter. Once inside, go to either the right or left of the cabin and go inside, where you will find a stairway leading up again. Go up and move around the room to find a door that is worth 750 points. Open this, and the power switch will be to your right when you walk in.