There's no doubting that Gamerscore has been a phenomenal success for this generation of consoles. Microsoft's scoring system has proven to be an addictive mechanism that has incentivised gamers to keep playing even when a game is completed. So much was its success, that Sony even got into the act with the belated introduction of Trophies.
But if there's one thing we hate more than anything else, it's those odd-numbered achievements that mess up your score. Here's our pick of five of the offenders