Unreal Tournament 3

Seemings as the video guide that is on here doesn't actually tell you what to do for this achievement I will explain. What you have to do in a multiplayer match is, using a shock rifle shoot the secondary fire or left trigger which shoots a ball out of the rifle then you have to shoot that ball with the primary fire of the weapon also known as right trigger when this is done correctly the ball will explode in a small radius and this is what has to kill the enemy for you to get the combo king award in game. Note that you need to get fifteen kills of this type to get combo king in a match. Repeat this in nine more matches and the achievement will pop.

It might be easier if you go to CTF, then Facing Worlds; replace all the weapons (with mutator) to shock rifle. Facing Worlds is ideal as the enemy will always spawn at the same area, saves times. Also, set the goal limit to 1, so once you get the combo award just capture the flag once to end the game.

Use the Left trigger on the enemy (not directly at him though) then use Right trigger and shoot the ball; if done correct the ball should expand and explode. Repeat this nine more times and you'll get the achievement. It is best to do this with two controllers, if not just put 1 novice bot.

This just expands on the other solutions above and please follow TheSlipperyGimp's for info on how to pull off a shock combo. I did find aiming at the edge of the weapon was more successful for distance judging.

I hadn't played the game in a while so was unsure r.e. the settings required, to make things easier for everybody this is what i used.
If using 2 controllers:
Sign in primary (gold), secondary (can be silver) & launch game.
Select: Start> Instant Action> Capture the Flag.
Map: Facing Worlds.
Server: Max: 2, Min: 2, Private: 2.
Settings: Split Screen: Yes (you might need to scroll up to see this as its easy to miss), respawn: yes, score: 1.
Mutators (accessed via pressing X on the above screen, Y to add to list): Speed Freak, Weapon Replacement.
- Highlight Weapon Replacement once it has been added, Press X to configure and set all to Shock Rifle. A to accept and back out of the menus until you can press A to begin.

Other tips:
It might help to turn up the announcer volume, and you are listening out for "Combo King", this normally will appear along with "Dominating" (15 kills). If you haven't heard it by now kill a few more, you might have not killed with a shock combo. This does show on screen however it is not always visible hence why i suggest listening out for it.

Once you have received the combo king announcement, cap the flag and let the score screen show, leave it until you can select A, followed by RT, to relaunch the same map. Repeat this a further 9 times and achievement is yours. This does pop in game.

If you stand right next to the helmet armour pick up at the other bases' spawn you can alternate left and right sides for quick spawn kills. Extra fun: How many double kills did you manage to pull off?

If you mess up or need extra ammo and did not collect from the kills you can find 4x shock cores from inside the enemy base behind you.

Open this video in YouTube and read the description.

To kill someone with the "Shock Combo" you must shoot the Alt Fire at a person, and then use the main fire to shoot the ball and make it explode killing anyone close to it.

Note: This may be easiest to do with 2 controllers, on a small map.*