Achievements
     Complete each achievement to get the allotted gamerscore.

Extreme Level 1 Completed (6)     Complete arcade extreme level 1 
                                  to win this achievement.

Extreme Level 100 Completed (50)  Complete arcade extreme level 100 
                                  to win this achievement.

Extreme Level 20 Completed (12)   Complete arcade extreme level 20 
                                  to win this achievement.

Extreme Level 50 Completed (25)   Complete arcade extreme level 50 
                                  to win this achievement.

Hard Level 1 Completed (4)        Complete arcade hard level 1 
                                  to win this achievement.

Hard Level 100 Completed (32)     Complete arcade hard level 100 
                                  to win this achievement.

Hard Level 20 Completed (8)       Complete arcade hard level 20 
                                  to win this achievement.

Hard Level 50 Completed (18)      Complete arcade hard level 50 
                                  to win this achievement.

Normal Level 1 Completed (3)      Complete arcade normal level 1 
                                  to win this achievement.

Normal Level 100 Completed (24)   Complete arcade normal level 100 
                                  to win this achievement.

Normal Level 20 Completed (6)     Complete arcade normal level 20 
                                  to win this achievement.

Normal Level 50 Completed (12)    Complete arcade normal level 50 
                                  to win this achievement.