Depends on what achievements you want…
The language trick works but if you ask me it’s cheap and for players who aren’t very good. Yes, some of the achievements are real hard to get but if you practice and try to get better in order to get that achievement it makes you better as a player.
Also try rumble pit to get achievements as well…
Let’s break it down into an example:
You want to get the overkill achievement. First off, you need to know what an overkill is (killing 4 players within 4 seconds of each other). Then practice with weapons that are good to get overkills with for example shotgun, sword, rocket launcher, hammer, plasma nades, etc. Once you get good with one of those weapons look for situations in-game to get the overkill. Try to setup situations where you might be able to get the overkill (throw nades and spray at multiple players to get them to come towards you). Also, get to high places on the map so you can see where all the other players are. Then, when there is a group of them together get down there are own them. For example, on Isolation there is that big metal bunker at the top of the hill where the shotgun is. Pick up the shotgun, run on top of the bunker, wait for a group of players to bunch up ,and use the shotgun to take them out quick.
Trust me; trying to actually get the achievements is way better then faking them. Not only will you feel better that you really did just do that, but you will gain A LOT of skill by practicing to get each achievement. Plus, you will also have some really cool vids to put in your file share that are real.
If there is a specific achievement you would like to get let me know. I can help you with getting better so you can get cool achievements. If you ever want to meet up on live send me a PM and ill send you my gamertag.