Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
100% Retro - Bomb	Reach 100% Retro - Bomb.	100
100% Retro - Hard	Reach 100% Retro - Hard.	100
100% Retro - Invisible	Reach 100% Retro - Invisible.	100
100% Retro - Normal	Reach 100% Retro - Normal.	100
100% Retro - Perspective	Reach 100% Retro - Perspective.	100
100% Retro - Speed	Reach 100% Retro - Speed.	100
20% Retro	Reach 20% Retro.	100
40% Retro	Reach 40% Retro.	100
60% Retro	Reach 60% Retro.	100
80% Retro	Reach 80% Retro.	100