Guacamelee! 2

If you don't have the DLC and have finished all Flame Face's challenges, this solution is for you. I found that if you entre Templo de la Serpiente from Isla Bonita continue left for a bit you will run into 3 basic enemies and 1 of the knife wending enemy just to the left them. This enemy can take 8 hits of your Pollo Slide and you can get the achievement off him pretty easily. If you kill him and don't get the achievement simply kill yourself with one of the dark voids and try again.

Good luck, leave a comment if you need any help.

Most easily done at the end of the game, when your stamina meter is as high as possible. The general theory is simply to find an enemy with a shield that the chicken can't break, then keep it in the air with Pollo Slide over and over again.

If you can't find one, and you're at the end of the game, try the Proving Grounds (from Villachula, go left to the Badlands and immediately up to the Proving Grounds). The middle door on the second level requires you to have your "Fury Fighting" tree maxed out (Flame Face skills). The first enemy room is a bunch of easy enemies with blue shields. You can slide back and forth until your stamina runs out. I did it with all the enemies still alive, just slide and watch a particular one. Try to hit it just before it touches the floor; six times in a row and you'll have your achievement.

EDIT: FYI, don't hit those enemies with an actual damage-dealing attack. That will begin the challenge and you'll die when your counter expires.

An easy way to get this achievement is to wait until later in the game when you have an almost complete stamina bar and go to Flame Face's Fight-A-Torium to complete the final challenge (should be for the Pollo Slide). As long as you don't complete the combos that Flame Face gives you to complete you should be able to hit your opponent (whose name escapes me) repeatedly without worrying about him dying.

If you do not complete the combos, you have as long as you need to get your six hit combo to unlock the achievement.

Some of the chickens in the game are (or at least seem) invincible. I got the achievement for picking on one of them. Had almost all the energy circles as I was after the end game.