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Old 11-03-2011, 12:36 PM   #7
DeathConvoy
 
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Join Date: May 2008
Location: Perth, Australia
Posts: 142

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I just got the three 5-player achievements using this method:

Beast / Casual / Azura, Me + Split Screen Guest, Mate1 + Split Screen Guest, Mate2. Win wave 1 (failing does not work), quit to lobby.

Horde / Hardcore / Blood Drive / Wave 10, Me + Split Screen Guest, Mate1 + Split Screen Guest, Mate2. Infinite Ammo, Instagib Melee, Super Reload, Set all 5 players to Onyx Guard. Win the wave.

Got 3 achievements in 5 minutes with just two extra players, so I returned the favor.
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