To obtain this achievement you must first build the Shield and then complete all Challenges to electrify it. After that simply melee a zombie to unlock the achievement.
Shield Parts:
1. Around the Lab B area (green water). The 3 spots it can spawn are outside the lab closest to the skulls. Look around the 3 or 4 trees in this area.
2.Around the Lab A area (blue water). The 3 spots are around where the cage drops down. Look around the pillars in this area.
3. This is in the AA gun area inside the bunker (very first door on the right). This area is small so it shouldn't be hard to find.
Once you have all pieces simply craft the item at a workbench (inside Lab A or Lab B).
Challenges:
Every player in the game must complete their 3 challenges for the lightning to strike. Once completed head to the area where the skulls are and lightning will periodically strike the altar. Have you shield out when this happens to electrify it.
There are a total of 16 possible challenges in Zetsubou No Shima. To view your challenges, look at the pillars near where the skulls spawn. Your own challenges will be lit up yellow. Once you complete a challenge you will be granted a reward. The bottom challenge will reward a Max Ammo, the middle will reward a gun, and the top will give you the ability to buy a 5th perk.
Here are the possible challenges along with tips to completing them.
1. Shoot 5 spores
- Very easy, just shoot any 5 spores around the map. The spores are the orange circles on the walls that explode when shot.
2. Kill 20 zombies underwater
- This can be completed in a few different locations: the spawn area, near the green water, near the main power switch, and in the underwater caverns. You have to be underwater but the zombies don't.
3. Kill 10 spore-infected zombies with headshots
- Walk zombies through the mist of an exploded spore and then headshot them while the mist surrounds their body. Do this to 10 zombies to complete the challenge.
4. Kill 8 spiders with spores
- Shoot spores to explode them and lure a spider into the mist. If done correctly the spider will die instantly after walking through the mist. The is easiest on spider waves which are usually around rounds 6/7 and 11/12.
5. Use a Spore to Regain Air Underwater
- You can do this in the water near the power switch or in the underwater cavern near the KT-4. Simply shoot a spore while underwater and be right next to it to regain air.
6. Kill a mutated zombie before its enraged
- Mutated zombies are the large Thrashers. This is easiest with the Skull of Nan Sapwe. If you hold Right Trigger while aiming at a Thrasher, it will die before it enrages. You can tell if it's enraged by the glow around its body. Red means its enraged. This is also easier with a strong pack-a-punched weapon.
7. Kill 3 zombies as they are mutating
- This occurs when a zombie walks into the spore mist and gets turned into a Thrasher. You have to kill the zombie in the moment as it begins to turn, but before it becomes a Thrasher. Walk zombies past spore mist to attempt this multiple times. One zombie automatically will turn into a Thrasher when you open the Bunker doors. A rocket launcher and pack-a-punched gun make this much easier.
8. Water the same plant 3 times
- Very simple. Just keep watering the same plant for three rounds in a row.
9. Destroy 5 webs with explosives
- Webs include the ones around Gumball machines, the ones around perk machines, and the general webs that the spiders use to block entrances. Simply stick a grenade to any 5 to complete this challenge.
10. Obtain a powerup from a plant
- Either don't want a seed and harvest it the next round, or go for the Blue Water plant listed above. Common powerups are Max Ammo and Points.
11. Water 5 Plants
- Very easy. Simply water any 5 plants.
12. Kill 15 zombies that are attracted to plants
- Create the Purple Water plant listed above. Then simply stay near it and kill zombies in the area. They will be attracted to the plant.
13. Use the Fan Trap to Kill 20 Zombies
- The fan trap is located in the entrance to the AA gun area (first door on the right inside the bunker). Simply use the trap until you have killed 20 zombies.
14. Use the Plane Trap to Kill 30 Zombies
- The plane trap is located in between the spawn area and Lab A. The trap uses two large propellers that chop up zombies. Simply keep using the trap until you have killed 30 zombies.
15. Eat a fruit from a plant
- To grow a fruit, water a plant using Blue, Purple, and Green water in that order. It is not guaranteed that this will be a fruit plant however so plant multiple seeds for better odds. Once you get a fruit plant hold X to eat the fruit.
16. Shoot the heads off of 5 mutated zombies
- Mutated zombies are the large Thrashers. Their heads are located on the left side of their chest (right if they are running towards you). It is next to the large spore on their chest. Shoot the head of 5 of them to complete this challenge.