Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
A hard day for the Aliens (8-bit)	Killed hundred enemies (8-bit)	40
Facing The Tunnel (16-bit)	Beat Level 3 (16-bit)	25
Fire Ball (16-bit)	Used the PowerUp twenty times (16-bit)	50
Here We Go Again (16-bit)	Beat Level 6 (16-bit)	30
High Score (16-bit)	Got 100.000 Points (16-bit)	20
High Score (8-bit)	Got 10.000 points (8-bit)	50
The Biggest Boss Killer (16-bit)	Killed The Guardian (16-bit)	120
The Biggest Boss Killer (8-bit)	Killed The Guardian (8-bit)	100
The Boss Killer (16-bit)	Killed the Flying Shellfish (16-bit)	30
The Boss Killer (8-bit)	Killed the Flying Shellfish (8-bit)	50
The Easy Path (8-bit)	Finished the game on easy mode (8-bit)	30
The Good Boss Killer (16-bit)	Killed the Doom's Destroyer (16-bit)	50
The Great Boss Killer (16-bit)	Killed the Metal Roadster (16-bit)	100
The Greatest Gun (8-bit)	Got all the gun's Upgrades (8-bit)	30
The Hard Path (8-bit)	Finished the game on hard mode (8-bit)	75
The Notable Boss Killer (16-bit)	Killed the Scarlet Skull (16-bit)	75
The Notable Boss Killer (8-bit)	Killed the Scarlet Skull (8-bit)	75
The Regular Path (8-bit)	Finished the game on normal mode (8-bit)	50