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Unlock them like you do with every game. If you're new to Xbox 360, achievements are based on special things you have done in the game. See the big green X in the middle of you're controller? Press that, and a menu will come up. Move to the left a few slides and you should see at the top it says "Gamerscore: (some number)" or something.
Select that and all of the games you have played will come up. Move to "Left 4 Dead 2" and select it. Another menu will come up featuring all of the achievements you have, and all the ones you have yet to get.
What else can I help you with?
What is left 4 dead 2 the product code?
It is a Key that will unlock the Left 4 Dead 2 in your steam library
How do you unlock the sacrifice in left 4 dead 2?
You don't, all campaigns are playable when you start Left 4 Dead 2.
How do you unlock mutation on left 4 dead 2?
it is in an update so update your version on xbox live to play it
What is the password on alice is dead 2?
it will be unlock and then unlock march
Are there achievements for Halo 2?
I believe that Halo 2 Vista has achievments.
Should you get left for dead 2 or army of 2 40th day?
Left 4 Dead 2!!
Is left for dead 1 better than left for dead 2?
No
Where can you download an original left 4 dead 2?
left 4 dead 2 can be downloaded from Steam
Is there split screen on left for dead 2?
Yes there is split screen for left 4 dead 2.
Will there be a left 4 dead 3 if so will it have the left 4 dead 2 characters?
no, left 4 dead 3 would not have the same characters as in 1 or 2
Is left for dead on xbox?
yea so is left 4 dead 2
Is there a dawn of the dead video game?
Actually, Left for Dead and Left for Dead 2 are based on the remade Dawn of the Dead.
