I just beat the game and completed every chapter.
But I noticed that I did not get the achievements for completing 2 chapters:
"My Stars! Complete chapter 7 - Mars. " and
"War is Heck! Complete chapter 8."

Is the game buggy?

If anyone have a fix or helping idea just let me know in this thread.

This game is buggy, ive completed the game, done every chapter. I never got the chievement for completing the game or for chapter 6. Any1 know of a fix for us!

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consolecommunity.com

you have to make sure that u do every level for each chapter. in order to get the ache. for the mars one you need to do the 2nd driving level of it to complete that chapter

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21 games 100% game score
13 arcade games 100% game score

I didnt get the acheeso for completing the game (yeah me!)

BTW if you use cheat codes in the game it blocks cheesos .

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http://www.xboxer360.com

Yea, the same thing happened to me on chapter 1 and  tutorial. all i did was just play the last section of the level again on chap. 1 as well as the tutorial again  and it unlocked no problem. From what i've while playing the game seems to have some gliches but isn't that bad. Hope this helps you out

Ive finished chapter 6 but no achievement, if i replay the chapter again is there a chance it will unlock?

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"Ive got my eye on you"