Borderlands

Krom is the third main boss in the game, he is located in Kroms canyon in the rust commons area. You will have to walk a long a valley with a lot of enenmies dotted around. The main bad guys to look out for are the Badass psychos and the Badass brutes which only seem to make an apperance further in the valley. Once you get near Krom you will see a small introduction cutscene of him shooting someone with his side arm. You will almost instally come under fire from his turret that has rockets and a 50 cal machine gun attached. You should stick to the rocks in the valley to kill the underlings and stay sheltered from his rockets.

Once you get a little higher there will be lots more enemies out to get you. Just keep using cover and take out the guys one-by-one until you get up to him then its just a matter of hammering him in. But I found the quickest way to do it was to use a rocket launcher and shoot the turret from a distance. This took me about 5-6 rockets and he was dead.

As others have stated, rocket launcher is the way to go here. An el-cheapo rocket launcher will work fine, so don't spend all your earnings on buying a rocket launcher. Try to make sure it has a scope as this will make things much easier. I used a launcher with incendiary element as it puts a damage over time (dot) on anyone in the Krom's bunker. But, as stated earlier, you don't need a good launcher for this part so you don't need any elemental attributes.

Krom is a good distance away so you've got to get closer. The right path provides more cover for you to use as you kill random bandits and psychos on your way to Krom. Do not move up the ramps until you've cleared the local bandit spawns. Then move up to the next platform and repeat - kill all bandits, then move on up.

By now you should have a Transfusion Grenade Mod, so use that if you lose shields. Don't wait to take damage before popping a grenade. Corrosive Rain Grenade Mod works well, but any grenade mod will be fine to help clear your path.

One thing you want to do is shoot all elemental barrels regardless if any bandits are near it. This prevents Krom's rocket launcher/machine gun doesn't hit them with you near them.

Once you've cleared all bandits, stop on the landing right before the second to the last ramp (the last ramp being the ramp that leads directly to Krom's bunker). If you stop here and move up the ramp just enough to aquire Krom as a target, his rockets from his rocket launcher cannot hit you because he fires 3 rockets that spin thus making him need a larger field of fire. You've just cut his field of fire by doing this. His machine gun will hit you, but that's a very minor attack. Just move up that second to last ramp and pop him with your rocket launcher, back down the ramp to reload and repeat to get your ezmode achievement.

When you head into Krom's Canyon to fight Krom make sure you have a good rocket launcher with you, one with a scope. The hardest part of the fight is getting in firing range. You will have to fight up hill through a shack village while being attacked by bandit and psycho enemies. Make sure to duck behind cover as you move up the ramps as Krom will be firing at you from his turret. Once you've gotten close enough to where you can get off a few clean shots simply fire rockets into the turret. You'll need to be decently close as the turret is in cover. Once the turret explodes Krom will die. Kill off the remaining enemies and go claim your loot at the top of the village.

Not sure about the rocket launcher method. Saw the little cutscene to show his name, then hid behind the first big rock you come to and took Krom out with a sniper rifle before even fighting any of the other enemies in the area.

If you are a berserker, the easiest way, if your build is based on the Tank branch, is to use your Berserk action skill and run all the up to the turret then take him out with shotgun/rocket launcher/grenades or whatever you got. If you go down you will have enough time to kill him and get a second wind before dieing. I was lvl 30 when i got there since i've done all available side-quests beforehand, and had over 1100 HPs and 525 shield. Berserkers can stay down twice as long as the others therefore giving them a higher chance for second wind. I just sprinted all the way up without even looking at the other enemies, popped 2 grenades at him and finished him off with the shotgun while i was downed. I was with a buddy also, so solo should be even easier since enemies are weaker.

This achievement is unlocked by killing Krom. Krom is located in Krom's Canyon in Rust Commons, and you must kill him as part of the main storyline. Therefore, if your achievement is not glitched, it is impossible to miss this achievement by completing the game.

Easiest way to kill Krom is with a rocket launcher. Sniper rifles do little damage against turrets no matter how powerful.
I had a helix rocket launcher which fired four rockets at a time. At this point in the game you should have a rocket launcher that does somewhere around 400 damage, the version of the helix I had did 404x3.
If you find the repair kit for the claptrap for the area it will lead you to a hidden area with a chest in. I received a infinite ammo rocket launcher, which did 888 damage, similar to the one after doing the first vault and killing the guardians.