Guild Wars 2

A leaderboard for each individual achievement
As a way to expand the use of achievements, and give guidance to players who may be sick of traditional content (without a huge continous developer investment), I suggest implementing leaderboards for achievements.

UI Intergration
This would attach a small button and a checkbox next to every achievement, allowing individuals to pin that achievement on their story tab in the top right hand corner.

Worldwide optional competition
Players could then redo that achievement an infinite amount of times throughout the day, and the top 10 achievers for that individual achievement would show up on a leaderboard.

Small rewards
Those who get the top spot would be awarded a laurel after the day has ended.

This would encourage truly competitive play outside pvp, and would be truly inclusive as any achievement could be focused on, meaning all styles of play could be potentially rewarding.

Increasing Game Depth
It would also give incentive for individuals to truly think about the game and it’s mechanics as absolute efficiency would be required to best everyone else on all servers.