First after 10 kills you get akimbo (dual) then at 25 kills you get FMJ (full metal jacket) and then for everything else you just get exp.
Complete all the challenges on Time Tangled Island. Complete all the challenges on Time Tangled Island.
There is challenges that you have to complete, for instance, if you want the golden AK-47 you have to complete all of the assault rifle challenges. And for the golden UZI you have to complete all of the sub-machine gun challenges, and so forth.
Complete all chao races and chao karate. Complete all challenges on every single level. Complete all racing challenges with all characters. Complete the Dark Story and the Light Story and "End". There might be more but i dont know them...
Complete the game 100% (all treasure chests found, complete all challenges with all three sigils)
its akimbo and is modern warfare 2 not cod6 you get it by completing challenges on the guns that can use it example-p90, vector, ump45,mp5k, mini-uzi, ranger, model 1887, and all the handguns and machine pistols
Unlock all the attachments and complete all challenges.
You complete challenges that unlock body kits, then do daily challenges for a long while
You become the owner of that Safari Zone after you complete all of Baoba's challenges.
Complete challenges and level up.
You dont, its a joke, all you have to do is complete 10 challenges.
You have to complete all thrasher challenges and then it will be drained
Complete all the challenges. You should probably start after beating the game. You can choose an episode, go to jobs & challenges and pick something marked not complete. There are some challenges in every numbered episode, prelude does not count