Achievement 

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

Achievement by Coldheart2236 October 10, 2008

Achievement 

Getting more popular in video games today, an achievement is a feat that the game records and displays for others to see that you have accomplished such a task. They are usually rewarded with points that have no real value other than to enlarge one's e-peen. Achievements were originally started by Xbox 360 Live. Other games like World of Warcraft have taken on this addition as well.

"Dude check out this achievement I just got for falling 30 feet off this cliff and dying!"

"GG"

Achievement by chickentenderz December 9, 2008

Achievement 

countable] a thing that someone has done successfully, especially using their own effort and skill
the greatest scientific achievement of the decade
It was a remarkable achievement for such a young player.
They were proud of their children's achievements.
AWL Collocations
uncountable the act or process of achieving something
the need to raise standards of achievement in education
Even a small success gives you a sense of achievement (= a feeling of pride).

Even a small success gives you a sense of achievement

Achievement by Viszuals On YOUTUBE June 2, 2020

achievement 

Successfully reaching OG during a sexual act.

"Britney Spears! Britney Spears! Britney Spears! Brit-........... uhh..... achievement!"
"Oh that's just sad."
"For ****'s sake! I'm in here! Get out!"

achievement by Alex Quantashassle July 16, 2008

achievement hunter 

A video gamer who plays games to unlock achievements on a gaming service, such as Microsoft Studios' Xbox Live, Sony Computer Entertainment's PlayStation Network (trophies), and Valve Software's Steam. Achievement hunters often have a tendency to be completionists.

The term is named after the popular Rooster Teeth Productions division called Achievement Hunter, which started out as website for achievement guides before becoming a well-known Let's Play group.

My friend is an achievement hunter. He won't stop playing a game until he unlocks every single achievement out of it.

achievement hunter by Just Another Anonymous Person August 30, 2014

Achievement unlocked 

A phrase used mainly by the gamer community to express a feeling of satisfaction after having successfully completed a particular task or venture.

"Achievement unlocked" is the official phrase used on Microsoft's Xbox 360 console. The phrase appears on the screen after the player has accomplished a specific in-game task.

The phrase was first used out of game context in the comedy series "The Guild."

Mariam: Victor, your idea to add nap rooms inside the corporate offices has been accepted and will be implemented next week.

Victor: Achievement unlocked!

Achievement unlocked by Coniption February 26, 2011

Achievement First 

Lame ass school that needs to be shut down. DO NOT GO HERE, BY ANY MEANS‼️ The teachers, cuticular, and whole school is shitty, lame af😐

You go to Achievement First? That’s mad dayroom😭

Achievement First by Ldd😉 June 24, 2019