I say the name of an achievement, the next poster has to make up a task to unlock the achievement and decide how much Gamerscore it's worth and they also name a new achievement.
example:
guy 1:Say What AGAIN!
guy 2: Kill an enemy with a shot to the kneecap (10g)
Hunter of Men
guy 3: Hit an enemy and then finish them off at least 15 seconds later (10g)
Hedgeclipper
Now the next poster make up a task to unlock "Hedgeclipper". You get the idea.
example:
guy 1:Say What AGAIN!
guy 2: Kill an enemy with a shot to the kneecap (10g)
Hunter of Men
guy 3: Hit an enemy and then finish them off at least 15 seconds later (10g)
Hedgeclipper
Now the next poster make up a task to unlock "Hedgeclipper". You get the idea.