Ok the first DLC pack to do is the Ultor Exposed pack. This DLC was essentially made to promote THQ's upcoming release of Red Faction, but on to the achievements.
When playing through any mission if you have the DLC's there are 2 achievements tied to campaign scoring. There are a lot of missions in the game and you only have to win 5 each, so when playing missions if someone needs the achievement let them drive and do all the killing to get the most points, but these are 2 easy achievements. If you have done all the missions already, then don't sweat it, just go to a notice board and choose to replay any mission and trade off wins with your co-op partner, very simple.
Win the Co-op competitive mission game 5 times
After completing one of the last levels in the Ultor Exposed pack, you will get this achievement:
Complete the Ultor Exposed misison arc
Now all you have to do is simply call your new homie from your phone and it will unlock this achievement:
The final DLC achievement for this pack is for hosting a party lobby. This is a very easy achievement, go into the multiplayer lobby and press X to switch it to a party lobby, this will then allow you to set custom rules to the next match. Invite a friend, start the match and then boom, achievement unlocked.
Host or play in a party match on Xbox LIVE
The next DLC pack is called Corporate Warfare. Play through all the DLC missions and then at the end of the missions you will get this achievement for doing the last one:
The next few achievements are obtained by doing the Stuntman diversion. The easiest way to get these is to find a long stretch of road and go for the stars of incoming traffic. When you start it should come up saying press Y to start co-op diversion, and this is a versus mode to see who can do the best diversion. A simple way to boost this is: having player one get a score of about 400, then stop. Player 2 then gets a score of 300 and stops, giving a round win to player 1. Now just keep alternating wins until both players have 20 rounds won. You should then get these 2 achievements:
While boosting or playing a Strong Arm match, just spray tag all 4 locations on the map to unlock this achievement:
Your team needs to hold all tag spots at one time in a Strong Arm match on Xbox LIVE
The last DLC achievement is for winning 10 Gangsta Brawls or Team Gangsta Brawls. Just set up a private party with custom settings and trade off wins, very easy to do.
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