While I appreciate Dr Gonzo's input on the new achievements, his solution for this one is slightly incorrect. No disrespect intended, but the methods for this achievement are actually much simpler than the previously stated instructions make it seem.
Firstly, you'll obviously want to select the Klassic Tower, then select Alien. As Dr Gonzo stated, variation does not matter. If you want a slightly easier time, select the Konjurer variation, as you can use the Ovomorph move (Down - Back - X, followed by Down - Back - X again if the opponent isn't near the Ovomorph egg to have the Facehugger jump to them) to trap your opponent, making it easier to hit them with the interactables. Try to keep your opponent away from the interactables for the first round. You DO NOT have to prolong the match to three rounds. I repeat, YOU DO NOT HAVE TO PLAY THREE ROUNDS. Losing once is unnecessary, and makes it more likely that the AI will beat you to one of them, requiring you to go back to Character Select and try again. Once you get to the final round, whether it be the second or third should you have lost once, start setting up for the interactables. I personally did this on Dead Woods, since it was the first eligible stage I came across on the Tower. The requirements for each stage are:
Each interactable is listed as INTERACTABLE ___
. These are the interactables you need to use in the final round to activate the BRUTALITY TRIGGER
. If a stage has multiple brutalities, these are listed as BRUTALITY TRIGGER ___
. Unless otherwise stated, you must use the listed INTERACTABLES
before using the BRUTALITY TRIGGER
Lin Kuei Temple
Quan Chi's Fortress
Put simply, just win the first round, then start using the listed interactables for your selected stage. Make sure that ALL the required interactables are NOT BLOCKED and that they DO NOT MISS. You do not have to lose a round, and the interactables do not need to be used in any specific order outside of the one that is supposed to deal the final blow, which must be used last. Set the difficulty on Very Easy, and wait until you get one of these stages. Very easy achievement, but it needed a little extra information in addition to what Dr Gonzo already added. To address BrutalGuitar's comment quickly, Stage Fatalities do NOT count towards this achievement. The game must call it a Brutality for the achievement to pop.
Below is when I popped the achievement. I just used Game DVR for this, so you can't see it actually pop, but as you can see I did not need to lose a round and had previously used the two listed interactables in this last round, then threw the log from jump distance.