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1 definition by Coldheart2236

 
1.
Achievements are synonymous with Gamerscore on the Xbox 360.
When you unlock an Achievement, you get Gamerscore. To unlock an Achievement, you need to fulfil a specific task.
Achievements vary in difficulty to unlock; some take little to no effort whatsoever, whereas some are nigh impossible to achieve.
Example of an easy Achievement to unlock:

Gears of War: Prison Breakout -
Completed tutorial level on any skill level

Example of a hard Achievement to unlock:

Gears of War: Seriously ... -
Kill 10,000 people in versus ranked match total
by Coldheart2236 August 17, 2008