So obviously for this achievement, all you need to do is get 25K points in the challenge mode on this game, you'll unlock a ton of other achievements too.
But the real reason i am making a post is to mention the fact that this achievement may be glitched. I don't know for sure, but it did not unlock for me right away. If this happens to you as well and would like to fix it, this is what i did. I deleted the game and the local save from everything, Then, give the game about 5 minutes and re download it. Then obviously, try again. But even though you get the 25k again, it may not unlock, if that is the case what i did was simply click on the achievement in the menu when you press the xbox button and go to the games club. When i did that, the achievement unlocked.
Hope this helps if this happens to you as well.
(P.S. i know this game is like a year old already but for anyone who stumbles across it like i did this post is for them to be cautious)
Happy Hunting Gamers!