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AuthorSolution
xI Jason93 Ix
90,832
xI Jason93 Ix
Achievement won on 30 Sep 11
TA Score for this game: 658
Posted on 02 October 11 at 22:47, Edited on 03 October 11 at 16:50
This solution has 30 positive votes and 4 negative votes. Please log in to vote.
The easiest way I found to get an Onyx Medal is in Horde mode where you need to make "1,000 Fortification Modifications":

An easy solution is get a second controller and log in as a "guest".
Start up a private Horde match.
Set it to any difficulty you want because it doesn't really matter all that much, unless you suck in which case make the difficulty fairly easy. :P
I used Checkout for the map, doesn't matter what map you choose really, I just preferred Checkout.
When the match starts use one of the controllers to "build your base", doesn't matter which controller you use as it costs nothing to build your first base.
Take control of the "guest" account and give all the money to your main character.
Build a turret with the money you've been given.
Make the "guest" take control of the turret and start firing.
As the turret's firing, spam Y when you're next to the turret with your main character and watch your money slowlyyy go down.
During the rounds make your "guest" account go into cover so it doesn't die. And when the rounds over put 'em back at the turret and rinse and repeat.
It'll take a few rounds if you have 0 fortification modifications, but if you have 500+ like I did, it'll take 5-10 minutes at the maximum. :)
ALSO, this can only be done between rounds as you can't upgrade or build fortifications during rounds.


HOPEFULLY I made all that sound clear.
PaulGreg Good idea, however it might be worth mentioning that this can only be done between rounds, thumbs up
Posted by PaulGreg on 03 Oct 11 11:55:13
xI Jason93 Ix Ahh yes, I knew I forgot something! Thankyou. :)
Posted by xI Jason93 Ix on 03 Oct 11 16:47:37
demont101 I was going to post this same solution cuz I just did this lol it's a great idea I was just beaten to writing it
Posted by demont101 on 07 Oct 11 15:48:06
MattyJWest Good solution, only took me 15 minutes to finish off (had ~500 upgrades already from regular Horde) and it certainly beats playing a piano for 6 hours!
Posted by MattyJWest on 10 Oct 11 23:55:36
Bobo Magroto Thats my first Onyx as well, you can get this one on your own easily without the guest, time consuming but you'll get after a bit (especially when some Fortification LV1 to LV2 upgrades cost $0)
Posted by Bobo Magroto on 26 Dec 11 00:26:24
PRIME SIX Works great. Thanks!!!
Posted by PRIME SIX on 11 Jun 12 15:09:17