Achievements
     Complete each achievement to get the allotted gamerscore.

Ninja 5 All Normal Missions (40): Complete all normal missions 
                                  with Ninja 5 rank!
1 Secret Mission Cleared (20):    Clear 1 secret mission.
10 Ninja 5 ranks (20):            Complete 10 missions with Ninja 5 rank!
100 Stealth Kills (30):           Defeat 100 enemies with Stealth Kills!
1000 Stealth Kills (50):          Defeat 1000 enemies with Stealth Kills!
2 Secret Missions Cleared (20):   Clear 2 secret missions.
20 Stealth Kills (20):            Defeat 20 enemies with Stealth Kills!
3 Secret Missions Cleared (30):   Clear 3 secret missions.
30 Ninja 5 ranks (20):            Complete 30 missions with Ninja 5 rank!
300 Stealth Kills (30):           Defeat 300 enemies with Stealth Kills!
4 Secret Missions Cleared (40):   Clear 4 secret missions.
5 Secret Missions Cleared (50):   Clear 5 secret missions.
50 Ninja 5 ranks (30):            Complete 50 missions with Ninja 5 rank!
50 Stealth Kills (20):            Defeat 50 enemies with Stealth Kills!
500 Stealth Kills (30):           Defeat 500 enemies with Stealth Kills!
700 Stealth Kills (40):           Defeat 700 enemies with Stealth Kills!
Cleared Story (50):               Clear the story.
Killed 10 Tomikichi (20):         Kill 10 Tomikichi.
Killed 20 Tomikichi (30):         Kill 20 Tomikichi.
Killed 30 Tomikichi (30):         Kill 30 Tomikichi.
Killed 40 Tomikichi (40):         Kill 40 Tomikichi.
Killed 5 Tomikichi (20):          Kill 5 Tomikichi.
Killed 50 Tomikichi (50):         Kill 50 Tomikichi.
Mission 10 Cleared (20):          Clear up to mission 10.
Mission 20 Cleared (30):          Clear up to mission 20.
Mission 30 Cleared (30):          Clear up to mission 30.
Mission 40 Cleared (40):          Clear up to mission 40.
Mission 5 Cleared (20):           Clear up to mission 5.
Mission 50 Cleared (50):          Clear up to mission 50.
Ninja 5 All Easy Missions (30):   Complete all easy missions 
                                  with Ninja 5 rank!
Ninja 5 All Hard Missions (50):   Complete all hard missions 
                                  with Ninja 5 rank!