Condemned 2 - Bloodshot

I found the easy way to get this was to go into Fight Club on the practice arena. You need to use each level (1,2,3) of chain attacks for each left and right fist. In the top right of your screen you will see the chain attack meter, as you beat up enemies you will see the boxes fill up.

To perform a level 1 chain, completely fill up the first box and perform a chain attack (double tap LT or RT - LT for left handed attack, RT for right handed attack). It will then go into slo-mo and you will be required to hit the LT or RT buttons to perform the chain attack. You will know if you are successful when your chain attack meter empties (it will not empty if you do not perform the attack).

To perform a level 2 chain, completely fill up the first two boxes and perform a chain attack (double tap LT or RT - LT for left handed attack, RT for right handed attack). It will then go into slo-mo and you will be required to hit the LT or RT buttons to perform the chain attack. You will know if you are successful when your chain attack meter empties (it will not empty if you do not perform the attack). The second level chain attack will end up breaking the arm of the thug.

To perform a level 3 chain, completely fill up the all boxes and perform a chain attack (double tap LT or RT - LT for left handed attack, RT for right handed attack). It will then go into slo-mo and you will be required to hit the LT or RT buttons to perform the chain attack. You will know if you are successful when your chain attack meter empties (it will not empty if you do not perform the attack). The level 3 chain attack will shove the thug onto the ground and you will be required to quickly tap the RT or LT triggers to snap the thugs neck. This of course will kill him.

After you perform 5 of each level and of each fist you will unlock the achievement. you can check your progress under the extras, achievements tab in the game. This will show you how many chains of each fist and of each level you have performed.

hope this helps!

To add on to what Mind Killer UK

I used the mac 10 sub-machine gun to fill up my three bars

Just fill up each bar and do both sides 5 times and the move on to the next bar.

To add to GTPBigDog's solution if you are finding getting to level 3 hard in the practice area (like i did). You can go to the last level on the story mode.

your meter goes up real fast when you shoot enemies. When ur meter has filled up the 3 blocks throw away your gun and start the level 3 combo. You can kill yourself and redo a cheackpoint to make it easier aswell. :)

Go to practice arena Choose Thug then 1 at a time then choose FIREARMS and Molotovs.That way when it starts go over to left wall of weapons.Pick up the Assault Rifle then from open area between molotovs aim at staircase.1st guy then left behind table then straight behind.Keep doing this counter clockwise with headshots.Meter fills crazy fast.Very simple just do each combo seperate to keep track mentally.GOOD LUCK!!!!If anyone needs to boost Mp hit me up.....

Best way to quickly grind out this achievement is to load up the first level on easy. Play through until the game teaches you about environmental kills.

Instead of initiating the environmental kill (don’t pull LT+RT when he’s on his knees), just keep alternating between left and right punches to build your chain meter. Once the meter reaches the desired level, execute a chain attack. This particular enemy is invulnerable to any attack that isn’t an environmental kill, so just repeat with each level to quickly unlock this achievement.