How do you earn bonus achievements on Modern Warfare 2?

1. I'm not sure what you mean by achievements. Whether you mean Xbox 360 achievements, or challenges in the game. For the challenges in the game, yes you earn them by doing all those things and even more. You see, there are certain categories of challenges, and as you level up, you unlock more.

2.The EMP and the Nuke are killstreaks, and you do not have to be a certain level to unlock any killstreak. After a certain number of levels, you earn an "unlock", and you can choose whatever killstreak you want to unlock, then you assign it to one of your killstreaks when you want to.

3. You can't earn PS3 or Xbox 360 achievements (the ones which are counted outside the game) online, only offline through the campaign.

I dont understand why there are maximum of haters. however the story is kinda short and that i generally play multiplayer. So in case you have information superhighway you should definitly purchase it :) The campers and persons with grenade lauchers arent a subject. perhaps reason the others suck. I never performed any First individual shooters till now. And after each and every week i've got been given quite solid. You kinda suck on the beginning up, yet finally you will dominate the battlefield. game 9/10

There is no bonus achievements, but you can get extra exp by completing challenges in the baracks